Vasculitis in Systemic Autoinflammatory Diseases

Autoinflammatory diseases (AID) are diseases of the innate immune system, characterized by recurrent episodes of localized or systemic inflammation. Vasculitis may accompany AID. The causes of the association of vasculitis with monogenic AID are still debated. Among the monogenic AID, Familial Mediterranean Fever (FMF) is the most common. IgA-related vasculitis (IgAV) and Polyarteritis Nodosa (PAN) involving small and/or medium-sized vessels have an increased frequency among FMF patients. There are also case reports revealing vasculitic features in Cryopyrin-Associated Periodic Fever Syndrome (CAPS), Tumor Necrosis Factor Receptor-Associated Periodic Syndrome (TRAPS), Mevalonate Kinase Deficiency (MKD), also known as Hyper IgD syndrome (HIDS), Deficiency of IL-1 Receptor Antagonist (DIRA) and Pyogenic Arthritis, Pyoderma gangrenosum, and Acne (PAPA) patients. Central nervous system vasculitis and vasculopathy have been reported in DIRA and PAPA patients whereas small vessel involvement affecting skin has been reported in CAPS, TRAPS, and MKD patients. Alternatively, vasculitis can also be a leading feature especially in the recently defined monogenic AID (Otulipenia, Deficiency of Adenosine Deaminase 2-DADA2, Haploinsufficiency of A20) and interferonopathies (STING-associated vasculopathy with onset in infancy-SAVI). DADA2 often presents as a PAN-like disease. In otulipenia, patients have painful subcutaneous nodules caused by septal panniculitis with small and medium vessel vasculitis. Haploinsufficiency of A20 (also called Familial Behcet-like Autoinflammatory Syndrome) results in a phenotype very similar to the variable vessel vasculitis of Behcet's disease with recurrent oral-genital ulcers, in addition to, skin rash, uveitis, and polyarthritis. SAVI is an autoinflammatory vasculopathy with increased Interferon (IFN) signature, causing severe skin lesions resulting in ulceration, necrosis, and in some cases, amputation. Behcet's Disease (BD) is a multifactorial polygenic AID characterized by recurrent attacks of oral-genital ulcers, skin lesions, uveitis and a unique vasculitis affecting both arteries and veins of all sizes. Many clinical features overlap with other autoinflammatory diseases and overexpression of proinflammatory cytokines is an important feature of the disease.

Introduction

The first term used for a self-reacting immune-system was “horror autotoxicus” suggested by Paul Ehrlich (1). With the definition of autoinflammatory diseases, Dr. Kastner's group suggested the term “Horror Autoinflamaticus” for the autoinflammatory disease state, where the self-reaction is in the form of inflammation (2). At that time, the autoinflammatory diseases (AID) were described as unprovoked episodes of systemic inflammation due to abnormal activation of the innate immune system without high-titer autoantibodies and antigen specific T and B cells (2). These unique episodes generally occur periodically with fever and other systemic manifestations such as rash, arthritis, serositis, lymphadenopathy, central nervous system, and other organ involvements. AID can either be monogenic in nature due to a mutated single causative gene (FMF, CAPS, TRAPS, etc.) or a multifactorial polygenic disease such as Behcet's disease.

Vasculitis is inflammation of the blood vessel wall, generally categorized by the predominant type of vessels involved, not only in size (small vessel, medium vessel, large vessel, and variable vessel vasculitis), but also in structural and functional attributes (single organ vasculitis, vasculitis associated with systemic disease and vasculitis associated with probable etiology) (3). Vasculitis/vasculopathy in various forms is associated with many types of immune-mediated conditions such as autoimmune diseases and immunodeficiencies, as well as, a variety of infectious diseases. Autoinflammatory diseases are no exception. Generally, the heightened and spontaneous inflammatory response in autoinflammation is due to the insufficient or absent break mechanism of immune response, in which vessels seem to be commonly affected resulting in variety of vasculitis. Vasculitidies are among the differential diagnoses for autoinflammatory diseases as they share common features such as fever and skin involvement. Furthermore, vasculitis can also be either one of the features of or highly associated with an autoinflammatory disease (4, 5). In this review, we will discuss the vasculitic features of both monogenic AID and BD, as a multifactorial/polygenic AID (Figure 1).

FIGURE 1

Figure 1. A schema of monogenic and polygenic autoinflammatory diseases with vasculitic features. FMF, Familial Mediterranean Fever; IgAV, Immunoglobulin A vasculitis; PAN, Polyarteritis Nodosa; CNS, Central Nervous System; GN, Glomerulonephritis; CAPS, Cryopyrin Associated Periodic Fever Syndrome; MKD/HIDS, Mevalonate kinase deficiency/Hyperimmunoglobulin D syndrome; TRAPS, Tumor Necrosis Factor Receptor–Associated Periodic Syndrome; PAPA, Pyogenic Arthritis, Pyoderma gangrenosum; PASH, Acne Pyoderma gangrenosum; Acne, Hidradenitis Supurativa; LUBAC, Linear ubiquitin chain assembly complex; SAVI, STING-associated vasculopathy with onset in infancy; CANDLE, Chronic atypical neutrophilic dermatosis with lipodystrophy and elevated temperature syndrome; DIRA, Deficiency of Interleukin-1 Receptor Antagonist; DADA2, Deficiency of Adenosine Deaminase-2 (DADA2); DITRA, deficiency of the interleukin-36 receptor antagonist; PFAPA, periodic fevers with aphthous stomatitis, pharyngitis, and adenitis; CNO/CRMO, Chronic nonbacterial osteomyelitis/Chronic recurrent multifocal osteomyelitis; SAPHO, Synovitis, Acne, Pustulosis, Hyperostosis, and Osteitis.

Monogenic AID

Inflammasomopathies

Whether vasculitis in inflammasomopathies is a true component of the disease or it is an association is still controversial. Chen et al. demonstrated in a Kawasaki mouse model that NLRP3 inflammasome activation was associated with development of coronary arteritis (6). In another mouse model, it has been observed that infusion of visfatin, a major injurious adipokine during obesity, increased NLRP3 inflammasome formation and IL-1 production leading to enhanced endothelial inflammatory response and endothelial dysfunction (7). However, the molecular mechanisms of the vasculitic features of inflammasomopathies are far from clear.

On the other hand, some vasculitides are indeed more common among these patients. It has been suggested that this is due to the enhanced innate immune response in these patients (8). However, occasional vasculitic features have been shown in Tumor Necrosis Factor Receptor-Associated Periodic Syndrome (TRAPS) (see below).

Familial Mediterranean Fever (FMF)

FMF is the most common AID in childhood. It is characterized by recurrent febrile episodes with serositis, synovitis, and erysipelas-like erythema (ELE), which usually subside within 24–72 h. The disease is associated with the MEFV mutations encoding a protein called “Pyrin” (9). ELE is the characteristic skin rash in FMF patients; however, the histopathologic features of these lesions are not consistent with vasculitis (10). The most common vasculitis associated with FMF, with a frequency of 1–7%, is Immunoglobulin A-associated vasculitis (IgAV or otherwise known as Henoch Schönlein Purpura) (11–14) (Figure 2A). MEFV mutation has also been shown to be more common among IgAV patients (15, 16). IgAV in FMF patients has a different course; it tends to reoccur several times, is seen in younger children, and the rash can develop in unusual locations such as the face and trunk (17). In studies where a biopsy was available, leukocytoclastic vasculitis without IgA deposition was shown (17). Ben-Chetrit et al. suggested that vasculitis similar to IgAV seen in FMF is a distinct feature of FMF itself (17). However, it has also been suggested that certain inflammatory diseases are more frequent in FMF because of the exaggerated immune response (8).

FIGURE 2

Figure 2. (A) Atypical purpuric rash in a patient with FMF who developed IgAV/HSP (B) Ischemic lesion due to medium-size vessel involvement in a child with FMF who developed PAN.

Another common vasculitis seen in FMF is PAN (polyarteritis nodosa), which can be found in 1% of FMF patients (11, 14). PAN in FMF tends to have a younger-onset, more frequent perirenal hematomas, more severe myalgia, and an overall better prognosis (18) (Figure 2B). Elevated Antistreptolysin-O, but not hepatitis B antigen titer, was seen in PAN-FMF patients (18). There is still no consensus on whether PAN seen in FMF is coincidental or directly associated (18).

Besides these common vasculitic manifestations, there are some case reports of FMF patients with central nervous system involvement (19, 20), coronary vasculitis (21), large vessel vasculitis (similar to Takayasu arteritis) (22), and cutaneous vasculitis with immune-complex glomerulonephritis (23).

Treatment with high-dose corticosteroids along with immunosuppressants, as deemed necessary, have been used. Although FMF is a disease with multiple exacerbations of fever, skin rash, and other symptoms, interestingly, most reports and series of vasculitis described single episodes often responding well to immunosuppressive therapy (24).

Cryopyrin Associated Periodic Fever Syndrome (CAPS)

CAPS is a rare AID caused by a mutation in CIAS1 gene and is characterized by periodic fever, urticarial rash, arthritis, conjunctivitis, and neurological involvement, including hearing loss and aseptic meningitis. It was historically considered as three distinct clinical diseases: Familial Cold Autoinflammatory syndrome (FCAS), Muckle-Wells Syndrome (MWS), and Chronic Infantile Neurological Cutaneous and Articular Syndrome (CINCA)/Neonatal-onset Multisystem Inflammatory Disorder (NOMID), but is now recognized as a severity spectrum rather than separate entities (25). The typical skin lesion is neutrophilic urticarial dermatosis with perivascular and peri-eccrine infiltrates without evidence of vasculitis (26). There are only case reports revealing small vessel vasculitis of skin and testis (27) and also retinal vasculitis (28, 29) responsive to corticosteroid and azathioprine treatments. Therefore, vasculitis is not regarded as an integral part of CAPS but can be seen as a coexisting disease.

Mevalonate Kinase Deficiency/Hyperimmunoglobulin D Syndrome (MKD/HIDS)

HIDS is characterized by recurrent fever, rash, lymphadenopathy, gastrointestinal manifestations and, in severe forms, neurological abnormalities, and ocular and auditory findings (30). The most common types of rash are erythematous macules, papules, urticarial lesions, and erythematous nodules (31). The original article, van Der Meer et al. reported that the skin biopsy of a patient during attack had lymphocytic vasculitis with mononuclear infiltrates around vessels high and deep in the dermis, swelling of the endothelium, extravasation of erythrocytes, and nuclear detritus (32). In another cohort of 44 HIDS patients, 10 of them underwent skin biopsy which showed mild features of vasculitis. Non-specific findings were noted in five biopsy specimens; sweet-like neutrophilic dermatosis in two, cellulitis-like findings in one, and deep vasculitis characteristics in another (31). There are also other case reports showing vasculitis in skin biopsies, with IgD and C3 depositions in one (33, 34). Therefore, skin vasculitis can be a component of HIDS.

Tumor Necrosis Factor Receptor–Associated Periodic Syndrome (TRAPS)

Tumor Necrosis Factor Receptor Associated Periodic Syndrome (TRAPS) is an autosomal dominant disease, caused by mutations in the TNFRSF1A gene. It is characterized by recurrent febrile episodes (lasting >1 week), serositis, periorbital edema, and myalgia with overlying migratory rash (25).

In a group of 10 TRAPS patients with skin biopsy, microscopic examination showed a superficial and deep perivascular and interstitial infiltrate of lymphocytes and monocytes without a clear evidence of multinucleated macrophages, granulomatous, or leukocytoclastic vasculitis (35). Lamprecht et al. reported 2 adult patients, one who had small vessel vasculitis and panniculitis with ANCA positivity against human leukocyte elastase, and another who had fasciitis and panniculitis (36). Another adult study from Spain reported leukocytoclastic vasculitis in 1 out of 6 TRAPS patients (37). Cammelli et al. reported the autopsy findings of a 26-year-old TRAPS patient that showed pronounced intimal thickening and medial hypertrophy of medium and small vessel walls without inflammatory cell involvement suggesting a systemic vasculopathy (38). Therefore, vasculitic features may accompany TRAPS.

Pyogenic Arthritis, Pyoderma Gangrenosum, and Acne (PAPA)/Pyoderma Gangrenosum, Acne, Hidradenitis Supurativa (PASH)

PAPA is an AID caused by PSTPIP1 gene mutation and is characterized by arthritis, severe cystic acne, and pyoderma gangrenosum (39). Hidradenitis supurativa is the characteristic feature of PASH. The skin biopsy of a PASH patient revealed a perivascular, interstitial infiltrate composed of neutrophils, demonstrating prominent leukocytoclasis, extravasation of red blood cells, and focal fibrin deposition within small vessel walls (40). Another case report of a patient with PAPA syndrome reported an unusual cerebral arterial vasculopathy/vasculitis that resulted in a subarachnoid hemorrhage from a ruptured dissecting posterior cerebral artery aneurysm, which was treated with an endovascular coil. However, it was not clear if PAPA syndrome itself caused the cerebral vasculitis, or if it was a co-existing condition (41).

Relopathies/Nuclear Factor Kappa-B (NF-κB) Related AID

The nuclear factor κB (NF-κB) pathway is tightly regulated through multiple posttranslational mechanisms, including ubiquitination. Linear ubiquitin chain assembly complex (LUBAC) mediated ubiquitination induces the NF-κB pathway; however, deubiquitinases such as A20, OTULIN, CYLD, and Cezanne, function as negative regulators of NF-κB signaling. LUBAC is a trimer composed of HOIL-1, 42, HOIP, and SHARPIN (43). Decreased expression of LUBAC complex subunits, in patients who carry mutations in HOIP or HOIL-1, results in inhibition of the NF-κB pathway in fibroblasts and B-cells, thereby causing immunodeficiency. The monocytes of these patients produce proinflammatory cytokines (43). A secondary vasculitis may be a part of these diseases; it is speculated that the NF-κB pathway is operative on inflammation in the endothelial cell. It was demonstrated in murine models that, the deficiency of the catalytic HOIP subunit of LUBAC leads to embryonic lethality at midgestation due to endothelial cell death and vascularization defect mediated by TNFR1 (44).

Otulipenia

Otulipenia is the result of the loss-of-function mutation of OTULIN, which encodes a deubiquitinase, causing an increase in canonical NF-κB pathway activation, accumulation of poly-ubiquitinated OTULIN target proteins, e.g., NEMO, RIPK1, ASC, TNFR1, and elevated levels of secreted proinflammatory cytokines, such as IL-6 and TNF (45). This paper reported 4 patients with this peculiar disease having neonatal-onset recurrent fever, neutrophilic dermatitis/panniculitis, lipodystrophy, and failure to thrive, but without obvious primary immunodeficiency (45). Skin biopsy of one of the patients revealed septal panniculitis and vasculitis of small and medium sized vessels (45).

Haploinsufficency of A20 (HA20)

Recently, Zhou et al. described a new AID caused by heterozygous loss-of-function mutations in TNFAIP3, leading to haploinsufficiency of A20 (HA20) and resulting in a very similar phenotype with variable-vessel vasculitis-Behcet's disease (46). Patients presented with early-onset, recurrent oral and genital ulcers, gastrointestinal manifestations, fever, polyarthralgia/arthritis, skin involvement, and cardiac and ocular manifestations. A review of 16 HA20 patients revealed retinal vasculitis in one patient and CNS vasculitis in another (diagnosed with brain imaging). In the third patient, CNS vasculitis (detected by frontal lobe biopsy) plus pulmonary artery emboli were found (47).

Interferonopathies

Type I interferonopathies comprise a group of heterogeneous autoinflammatory diseases associated with constitutive activation of type I interferon signaling. The intrinsic dysregulation of the interferon pathway affects the vasculature and results in vasculopathic features in these patients.

Aicardi–Goutières Syndrome

Aicardi–Goutières syndrome is an inflammatory disease that occurs due to mutations in any of the TREX1, RNASEH2A, RNASEH2B, RNASEH2C, SAMHD1, ADAR, or IFIH1 genes. It causes a phenotype similar to intrauterine viral infections such as congenital encephalopathy, basal ganglia calcifications, hepatomegaly, glaucoma, hypothyroidism, cardiomyopathy, and a demyelinating peripheral neuropathy. The interferon and IFN-related proteins are increased in both the peripheral blood and cerebrospinal fluid (48). From the largest cohort of 374 patients, intracerebral vasculitis was seen frequently enough to be confirmed as being associated with the Aicardi-Goutieres syndrome phenotype, especially in the patients with SAMHD1 mutations (48).

STING-Associated Vasculopathy With Onset in Infancy (SAVI)

SAVI is an autoinflammatory disease caused by gain-of-function mutations in TMEM173 (49). The disease is characterized by recurrent fevers, interstitial lung disease, increased inflammatory parameters, and failure to thrive; however, the hallmark of the disease, as its name applies, is the vasculopathy. Cutaneous manifestations were the most striking features of vascular changes. The nail fold capillary tortuosity and capillary loss in the early phase of the disease may lead to scarring of the acral areas, such as ear cartilage, and perforation of the nasal septum, dystrophic nail changes, resorption of distal phalanges of fingers and toes, and gangrenous digits, eventually necessitating surgical amputation (49).

Chronic Atypical Neutrophilic Dermatosis With Lipodystrophy and Elevated Temperature (CANDLE) Syndrome

CANDLE syndrome is another interferonopathy caused by mutations in PSMB8 resulting in dysfunctional proteasomes, which is also termed as one of the proteasome-associated autoinflammatory syndromes (PRAAS). Nakajo-Nishimura syndrome-NKJO (nodular erythema, elongated and thickened fingers, emaciation, large eyes, nose, lips, and ears, and loss of adipose tissue in the upper part of the body), and JMP syndrome (joint contractures, muscular atrophy, microcytic anemia, and panniculitis-induced lipodystrophy) are the other conditions under the PRAAS umbrella. The clinical features of CANDLE syndrome manifest as early-onset recurrent fevers, annular violaceous plaques, persistent violaceous eyelid swelling, failure to thrive, lipodystrophy, hepatomegaly, joint involvement, interstitial lung disease with a couple of specific laboratory abnormalities including chronic anemia, elevated acute-phase reactants and raised liver enzymes (50, 51). Skin biopsies of CANDLE patients revealed perivascular and interstitial dermal infiltrates extending into the subcutaneous tissue. Leukocytoclasis was often present, but true vasculitis with fibrinoid necrosis of the vessel walls has not been reported (52).

COPA Syndrome

COPA syndrome is a recently defined disorder of immune system which has been associated with type 1 interferon activation (53) This disease is an autosomal dominant inherited disease and caused by mutations in COPA gene, which encodes alpha subunit of coatomer protein complex I (COPα). COPα regulates the transition of proteins between the Golgi and the endoplasmic reticulum. The mutant COPA gene causes an increased endoplasmic reticulum stress due to impaired intracellular transport (54). Main features of Copa Syndrome include erosive polyarthritis, interstitial lung disease with or without pulmonary hemorrhage and kidney disease with autoantibodies (ANA, ANCA, RF, and others). Histopathologically, increased red blood cells and hemosiderin-laden macrophages were present in the alveolar spaces. Signs of pulmonary capillaritis were evident in most subjects with necrosis of the capillary walls. Neutrophils were often identified along the capillaries, consistent with immune-mediated hemorrhage (55).

In interferonopathies, JAK1/2 inhibition with baricitinib treatment showed promising results; it improved the clinical manifestations and inflammatory and IFN biomarkers in patients with CANDLE, SAVI, and other interferonopathies (56).

Other AID

Deficiency of Interleukin-1 Receptor Antagonist (DIRA)

DIRA is a very rare autoinflammatory syndrome primarily affecting the skin and bone and is caused by recessive mutations in IL1RN, the gene encoding the interleukin-1–receptor antagonist (57). Patients present in the neonatal period with severe neutrophilic “pustular” skin eruption, nail dystrophy, sterile osteomyelitis, and periostitis. In the original article, Aksentijevich et al. reported vasculitis in the connective and fat tissue adjacent to bone in the biopsy, and central nervous system vasculitis/vasculopathy on MRI in 1 out of 9 patients (57). The vascular features may be explained by an animal model: In the IL-1Ra (–/–) mice model, IL-1Ra deficiency in T cells activates them excessively, resulting in the development of aortitis in a TNF-alpha-dependent manner (58).

Vasculitis does not seem to be a common feature in other AIDs affecting bones such as CNO (chronic non-bacterial osteomyelitis), Majeed syndrome, SAPHO (synovitis, acne, pustulosis, hyperostosis, and osteitis), DITRA (Interleukin-36 receptor antagonist deficiency) and Cherubism, except that case reports of CNO patients with associated granulomatosis with polyangiitis (GPA) and Takayasu arteritis have been reported (59, 60).

Deficiency of Adenosine Deaminase-2 (DADA2)

DADA2 is another newly defined disease similar to polyarteritis nodosa (PAN) with recurrent stroke, livedoid skin rash, and immunodeficiency features. The most striking feature of the disease is vasculopathy. The reader is referred to the review on DADA2 in this issue and thus, we will not discuss it further.

Polygenic AID

Behcet's Disease

Behçet Disease (BD) is a multigenic autoinflammatory disorder of unknown etiology. It is a multisystemic disease and characterized by recurrent mucocutaneous, ocular, musculoskeletal, vascular, gastrointestinal, and central nervous system manifestations. It was first described in 1937 by a Turkish dermatologist, Hulusi Behçet (61). BD can affect arteries and veins of any size and thus, it has been classified as “variable vessel vasculitis” in International Chapell Hill Consensus Conference (CHCC 2012) (3).

Behçet Disease is more common along the historic “Silk Road” from Eastern Asia to the Mediterranean (62). Turkey has the highest prevalence rate (up to 420 per 100,000) (63). In case studies, BD is equally prevalent among male and female populations; however, the disease course is more severe in males (64). The diagnosis is based mainly on clinical findings and there is no specific diagnostic test. Due to the heterogenic clinical presentation of (BD), many different diagnostic criteria have been proposed to date. The International Study Group (ISG) diagnostic/classification criterion for BD is widely used (65). However, the ISG criteria do not involve vascular manifestations and it fails to classify most of pediatric BD patients. Recently, an international expert consensus group (the pediatric BD group) developed a new classification criterion for pediatric Behçet's disease (66). The performance of the new pediatric criteria was found to be 73.5% sensitive and 98.9% specific by Turkish and Israel groups (67). Currently, the Outcome Measures in Rheumatology (OMERACT) BD study group is working to develop a core set of outcome measures for BD, especially for vascular BD (68).

BD has similar clinical features with monogenic autoinflammatory disorders. Because of the absence of autoimmune T and B cells in pathogenesis, the episodic nature of the disease course, and the abnormally increased inflammatory response, BD has been considered as a polygenic autoinflammatory disease (69). It is suggested that environmental factors such as microbial agents may trigger the inflammatory episodes by inducing an aberrant immune response in genetically susceptible individuals (70). Recently Ambrose et al. showed over-expression of CXCL10 protein by IFN-γ stimulation in BD monocytes. They suggested that dysfunctional posttranscriptional regulation of CXCL10 mRNA, resulting in increased CXCL10 protein levels may contribute the exaggerated inflammation in BD (71). Despite the identification of newer genetic associations, HLA-B51 is still the most important genetic link affecting the disease risk and typical phenotype (72). BD has a complex genetic background in pathogenesis. Large genome-wide association studies (GWAS) have confirmed the association of BD with HLA–B51/B5 and have also shown an association with interleukin (IL)-10, and IL23R/IL12RB2, STAT4, endoplasmic reticulum aminopeptidase1 (ERAP1) genes (73–78). IL-10 is an anti-inflammatory cytokine, IL-23 has a role in inflammatory Th17 pathway and STAT4 is a transcription factor in signaling pathways related to IL-12, Type 1 IFN, and IL-23. ERAP1 is an aminopeptidase expressed in endoplasmic reticulum and is responsible for processing and loading peptides onto MHC class I molecules. Two single nucleotide polymorphisms (SNPs) in ERAP1 were found in association with BD and confirmed in different ethnic groups (76). The presence of SNPs in ERAP1 cause an unfolded protein response and endoplasmic reticulum stress triggering inflammation through the IL-23/IL17 pathway in BD (79, 80). Furthermore, GWAS described an epistatic interaction in the ERAP1 and MHC class I region. It has been shown that homozygosity for the ERAP1 variants is associated with an increased risk in HLA-B51 positive patients (76). Non-HLA genetic associations, such as ERAP1, IL23R, and IL10 variations, suggest that BD has some common susceptibility genes and inflammatory pathways with spondyloarthritis (70). However, this pathway fails to explain the vasculitis of BD.

In fact, vascular involvement is one of the major causes of morbidity and mortality in Behçet's disease and is more common and severe in males, particularly from the Middle East and Eastern Mediterranean (80, 81). Vascular involvement occurs up to 40% of patients with BD, 75% of them are presenting as venous involvement while 25% are arterial (64). Vascular involvement in BD has a relapsing course. In a recent study from Turkey, the recurrence rate of vascular events in BD was reported as 34.5%. A new vascular event risk was 23% at 2 years and 38.4% at 5 years (82). In the vascular cluster of BD, several types of vascular involvement may be seen together (82). There is an association between cerebral sinus venous thrombosis (CSVT) and pulmonary artery involvement (PAI) (82), intracardiac thrombosis and PAI (83), Budd-Chiari syndrome (BCS), and inferior vena cava syndrome (84). Lower extremity vein thrombosis (LEVT) often accompanies these combinations and often occurs prior to the other vascular involvements.

The vasculitis of BD has unique features. The involvement of the venous system is frequent and is almost always in the form of thrombosis. However, the thrombosis of BD does not result in emboli. It is also noteworthy that the arterial inflammation has not been associated with atherosclerosis.

The mechanism underlying the thrombosis in BD remains poorly understood and there are a number of studies in this field. Recently Khan et al. have compared the blood plasma of 72 healthy controls with 88 BD patients with or without thrombosis. They found that BD patients had significantly higher numbers of microparticles (MP) and MP expressing tissue factor (TF) and tissue factor pathway inhibitor (TFPI) than healthy controls. Furthermore, BD patients with thrombosis had increased levels of TF positive MP and decreased levels of TFPI positive MPs. They suggested that the intrinsic imbalance in the endothelium of the vessels results in the risk of thrombosis in BD (85). As previously mentioned, venous disease is more common than arterial involvement (86, 87). LEVT is the most frequent manifestation (86). BD associated LEVT has discriminative features when compared to LEVT due to other reasons. It has been shown that they had significantly more bilateral involvement, less complete recanalization, and more frequent collateral formation (88). Due to the extension of the LEVT, the most involved part of VCI is the infrahepatic part. Hepatic and suprahepatic VCI thrombosis cause Budd-Chiari syndrome (84). CSVT is common among children and it occurs generally shortly after the onset of the disease (89). Superior sagittal and transverse sinuses are frequently affected. CSVT is associated with other vascular involvements in the body, such as LEVT (90). LEVT and CSVT may be the early signs of other thrombi that will develop in the body. Superior and inferior vena cava occlusion, Budd-Chiari syndrome, cerebral sinus thrombosis, and other venous obstructive lesions are other common manifestations of involvement on the venous side (82, 91). Recurrent thrombosis of the lower extremities may cause post-thrombophlebitic syndrome (88).

Pulmonary artery involvement (PAI) is the most common form of arterial involvement in BD (92). Aortic, iliac, femoral, popliteal, and carotid arteries are the other commonly affected arteries. Although the most common arterial pathology is aneurysm, occlusion and stenosis with thrombi of the aorta, femoral, or pulmonary vessels can also occur (93).

PAI is strongly associated with LEVT, CSVT, and intracardiac thrombosis and it develops generally in the early stages of the disease (92). In a recent study, it has been shown that patients with extra-pulmonary arterial involvement were significantly older than the patients with PAI (82).

Pulmonary artery aneurysm (PAA) is an important cause of morbidity and mortality in BD and hemoptysis is the most commonly presenting symptom. The other significant type of PAI is pulmonary arterial thrombus (PAT). In a study of 47 BD patients with PAI, 72% presented with PAA with or without PAT and the remaining 28% with isolated PAT (83). The most common presentation of cardiac involvement is intracardiac thrombosis and is associated strongly with PAI (83, 94). Coronary artery vasculitis is not common but important because it may lead to acute myocardial infarction. Atherosclerosis does not increase appreciably in (BD) (95). However, a recent meta-analysis showed that flow-mediated inflammation was impaired and intima media thickness increased in BD, thereby causing an increase of subclinical atherosclerosis in BD (96).

EULAR recommendations of the BD management were updated in 2018 (97). According to the new recommendations, glucocorticoids and immunosuppressives, such as azathioprine, cyclophosphamide, or cyclosporine-A, are recommended for the management of acute deep vein thrombosis. For pulmonary artery aneurysms, high-dose glucocorticoids and cyclophosphamide are recommended as treatment options. In refractory patients, monoclonal anti-TNF antibodies could be considered and if the risk of bleeding is low, anticoagulants may be added, except for the patients with pulmonary artery aneurysms. For patients who have a high risk of bleeding, embolization should be the preferred treatment rather than open surgery. For both aortic and peripheral artery aneurysms, medical treatment with cyclophosphamide and corticosteroids is necessary before surgery; however, if the patient is symptomatic, surgery, or stenting should not be delayed. For the first episode of cerebral venous thrombosis, high-dose glucocorticoids are recommended to obtain rapid remission. Additionally, anticoagulants may be beneficial in patients who have an additional prothrombotic tendency.

Conclusion

Vasculitis can be a coexisting disease seen with AID. Vasculitis may also be one of the features of an AID and can even be the most striking feature of certain types of AID, such as Behcet's Disease, DADA2, SAVI, AGS, and HA20. The underlying pathology is still not clear. Increased IL-1, IFN, or immune-complexes may be the cause of endothelial damage. The more we understand the pathophysiology of vasculitis and AIDs, the better we can define the connections between these two conditions.

Ethics Statement

Written informed consents were obtained from the patients and their parents for publishing the pictures included in this manuscript.

Author Contributions

SD and ES drafted the initial manuscript, and revised and finalized the manuscript. FD and SO coordinated and supervised manuscript preparation, critically reviewed, and revised the manuscript. All authors approved the final manuscript as submitted.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

We would like to thank Aiyana Ryan for her assistance in the preparation of this manuscript.

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