Skip to main content

CASE REPORT article

Front. Vet. Sci., 08 November 2022
Sec. Veterinary Neurology and Neurosurgery

Case report: Presumptive subcutaneous malignant peripheral nerve sheath tumor with intracranial invasion and osteolysis in the posterior fossa of a dog

\nKyosuke HidariKyosuke Hidari1Yuya Nakamoto,
Yuya Nakamoto1,2*Keiichi SakuraiKeiichi Sakurai3Yoko SakuraiYoko Sakurai3Kazumi NibeKazumi Nibe4Miwa NakamotoMiwa Nakamoto1
  • 1Neuro Vets Animal Neurology Clinic, Kyoto, Japan
  • 2Veterinary Medical Center, Osaka Metropolitan University, Osaka, Japan
  • 3Sakura Animal Hospital, Kyoto, Japan
  • 4FUJIFUILM VET Systems Co., Ltd., Tokyo, Japan

A 13-year-old castrated male Toy Poodle presented with an acute vestibular disorder. Magnetic resonance imaging and computed tomography revealed a large oval space-occupying mass with skull destruction located from the subcutaneous tissue to the posterior fossa region. Histopathologically, the mass was a bundled growth of spindle-shaped mesenchymal tumor cells between the myofibrillar and collagen bundles. The cells were moderately irregular in size and had eosinophilic stained cytoplasm. The cells were highly atypical and had rare mitotic figures. Neoplastic cells were immunoreactive for S100, GFAP, Olig-2, SOX10 and immunonegative for NF, E-cadherin, and Claudin-1. Collective findings were presumptive with a diagnosis of malignant peripheral nerve sheath tumor.

Introduction

Peripheral nerve sheath tumors (PNSTs) mainly occur in the sheaths of peripheral nerves, among which malignant PNSTs (MPNSTs) have a poor prognosis. In MPNSTs, distant metastasis is uncommon, while local invasiveness is high. In addition to the peripheral nerves, PNSTs in dogs are derived from the central nervous system (CNS) and various other sites (1), including the greater omentum, adrenal gland, and third eyelid (24), with clinical signs and prognosis differing according to the site. MPNSTs have been reported in the intracranial region (57).

Case description

A 13-year-old, 5.0-kg castrated male Toy Poodle developed acute vestibular disorder, including horizontal nystagmus and stagger (day 1). Complete blood count results were normal at the referring hospital, whereas serum biochemical examinations showed a slight increase in alkaline phosphatase (160 U/L, reference range: 0–89 U/L) and blood urea nitrogen (36.0 mg/dL, reference range: 9.2–29.2 mg/dL) levels. Six days later, the patient was referred to our hospital because of worsening clinical signs (day 7). On admission, physical examination revealed a body temperature of 39.0°C, a pulse rate of 100 beats/min, panting, and a subcutaneous mass in the left occipital region. A neurological examination revealed ataxia with hypermetria, right-sided head tilt, left-sided hemiparesis, and induction of vertical nystagmus in the dorsal position. Except for disorder to the vestibular area, no other obvious cranial nerve deficits were noted. Mental status was alert. Based on these findings, paradoxical vestibular disorder was suggested, and the left cerebellar lesion was suspected. Differential diseases considered included cerebellar infarction, brain tumor, and meningoencephalitis. Head radiographs showed a mass with increased internal permeability and bone obscuration in the occipital area (Figure 1); however, the thoracic radiographs were unremarkable. Based on these findings, brain magnetic resonance imaging (MRI) and head computed tomography (CT) were recommended. Brain MRI was performed on admission, under general anesthesia, using a 0.4-T MRI system with a permanent magnet (APERTO Lucent, Hitachi, Tokyo, Japan), with the patient in the prone position. We used a human wrist coil and obtained T2-weighted images (T2WI: fast spin echo [FSE], repetition time/echo time [TR/TE] = 4,375/100), fluid-attenuated inversion recovery (FLAIR: fast inversion recovery [FIR], TR/TE = 8,292/78), and T1-weighted images (T1WI: spin-echo [SE], TR/TE = 400/15) with and without intravenous (IV) gadodiamide (0.2 mL/kg, OMNISCAN, GE Healthcare Pharma, Tokyo, Japan) in the transverse, sagittal, and dorsal planes. The MRI findings demonstrated a large oval space-occupying mass located from the subcutaneous tissue in the left occipital region to the posterior fossa and left cerebellar bridge angle region. The mass showed mixed hyperintensity on T2WI and FLAIR, mild hypointensity on T1WI, and strong enhancement on the margins and near the meninges on post-contrast T1WI (Figure 2). Additionally, MRI revealed brain edema around the mass, suggesting increased intracranial pressure. Head CT conducted using a CT scanner (Aquilion Lightning/Helios i Edition, Canon Medical Systems, Tochigi, Japan) showed occipital bone destruction at the lesion site (Figure 3). Since no obvious abnormal findings were found on chest and abdominal CT, the head mass was considered the primary lesion. Tru-cut biopsy was then performed to identify the lesion. Histopathological examination revealed bundled growth of spindle-shaped mesenchymal tumor cells between the myofibrillar and collagen bundles. The tumor cells were moderately irregular in size and had eosinophilic stained cytoplasm. The cells were highly atypical and had rare mitotic figures, whereas no intravascular tumor invasion was observed within the search area (Figure 4). For the immunohistochemical evaluation of the neoplastic cells, some antibodies below, antiglial fibrillary acidic protein (GFAP), anti-s100 protein, anti-neurofilament (NF), anti-olig-2, anti-sox10, anti-e-cadherin, and anti-claudin-1, were used. Neoplastic cells were positive for S100, GFAP, Olig-2, and SOX10 (Figure 5). However, they were negative for NF, E-cadherin, and Claudin-1 (Figure 6). The list of primary antibodies and protocols used in this study were summarized in Table 1. Based on the results of immunohistochemical staining, a diagnosis of suspected MPNST was made.

FIGURE 1
www.frontiersin.org

Figure 1. Plain X-ray film of the lateral view of the head. Radiolucent mass shadows in the occipital region (*) and opacification of the occipital bone (arrowhead) were observed.

FIGURE 2
www.frontiersin.org

Figure 2. Head MR images. Transverse T2 weighted (A), FLAIR (B), T1 weighted (C), and T1 weighted post-contrast (D) images at the level of posterior fossa, and sagittal T2 weighted (E) and T1 weighted post-contrast (F) at the level of the left cerebellum. A large mass lesion was found in the left occipital subcutaneous tissue, posterior fossa, and left cerebellar bridge angle region. The mass showed mixed hyper intensity was recognized extracranial region (*) and strong enhancement on the margins and near the meninges (arrow).

FIGURE 3
www.frontiersin.org

Figure 3. Cranial CT images [(A) bone conditions, (B) soft tissue conditions]. Contrast-enhanced CT image of the head. Soft tissue mass formation was observed mainly in the left temporal-occipital region (*). Furthermore, the region showed destruction of the occipital bone (arrowhead) and an unclear boundary with the brain parenchyma. No obvious metastatic findings were found in the chest or abdomen. CT, computed tomography.

FIGURE 4
www.frontiersin.org

Figure 4. Histopathology of the tumor lesions. A bundle-like growth of spindle-shaped mesenchymal tumor cells was observed between the myofibril and the collagen bundles. The tumor cells were moderately irregular in size and had eosinophilically stained cytoplasm. The tumor cells were highly atypical, and mitotic figures were rare. No intravascular invasion of the tumor in the search area was detected.

FIGURE 5
www.frontiersin.org

Figure 5. Immunohistochemical staining of the tumor. The tumor cells were stained positively for S-100, glial fibrillary acidic proteins, Olig-2, and SOX10 (x 600).

FIGURE 6
www.frontiersin.org

Figure 6. Immunohistochemical staining of the tumor. The tumor cells were stained negatively for NF, E-cadherin, and Claudin-1 (x 600).

TABLE 1
www.frontiersin.org

Table 1. Primary antibodies and protocols for immunohistochemistry.

Palliative therapy was administered at the owner's request. From day 7, prednisolone (prednisolone tablets; Takeda; 1 mg/kg once a day) and isosorbide (ISOBIDE; Kowa; 1 mg/kg twice a day) were started to reduce cerebral edema and intracranial pressure. On day 11, the patient exhibited intermittent tachypnea, with no obvious improvement in clinical signs. Mental status was depressed mildly, however, palpebral reflex or gag reflex were normal. Prednisolone was then changed to 0.5 mg/kg twice a day along the owner's wishes, but he was unable to stand on day 18. Upon arrival at the hospital, decreased consciousness, decerebellate rigidity, and tachypnea were observed, suggesting severe intracranial hypertension. After treatment for decreasing intracranial pressure (mannitol 2 g/kg constant rate infusion for 30 min, furosemide 1 mg/kg IV), his conscious level recovered, his respiratory state stabilized, and he was discharged. On day 19, his condition deteriorated, and the patient died.

Discussion

In the present case, the mass lesion extended intracranially and extracranially. Whether the tumor invaded from the outside in or the inside out had not been definitively determined, since postmortem examination was not available. At the onset of neurological symptoms, a large extracranial mass was already present, with destruction of the skull. Based on the time lapse from onset to diagnosis, it was considered highly likely that the tumor originated in the extracranial subcutaneous region and invaded intracranially with skull destruction.

Meningioma is the most common primary intracranial tumor in dogs, followed by glioma and histiocytic sarcoma (8). However, the formation of extracranial lesions with osteolysis has neither been reported in these tumors nor been reported in other primary intracranial tumors. A dog with glioma accompanied by temporal bone erosion has been reported, but no obvious extracranial lesion formation was observed (9). In humans, only rare cases of intracranial gliomas forming extracranial lesions with bone erosion have been reported (10, 11). Thus, it is extremely rare for primary intracranial tumors to spread extracranially with osteolysis in dogs. On the other hand, MPNSTs with bone erosion have been reported in dogs and cats (12, 13). In addition, primary scalp MPNSTs with cranial destruction and intracranial extension have been reported in humans (14). Rhabdomyosarcoma should also be carefully differentiated as a bone-destroying tumor arising in the head and neck region (15). From these reports, the possibility that the extracranial subcutaneous tumor in the occipital region could have caused intracranial invasion was considered in the patient.

In the immunochemical staining of timestamp performed in this study, almost all tumor cells were positive for SOX10 and Olig-2. A few of them were also positive for S100 and GFAP. On the other hand, they were negative for NF, E-cadherin, and Claudin-1. Among these staining results, positive results for Olig-2 and GFAP supported glioma as an important differential (16). However, positive results for S100 and SOX10, which have been reported to be highly specific for MPNST (1719), were considered negative for glioma. In addition, the strong positive finding of Olig-2 further supported MPNSTs of peripheral nerve origin and ruled out perivascular wall tumors, which are considered to have very similar histopathologic features to MPNSTs (1, 20). From these findings, the tumor in this case was concluded the subcutaneous MPNST. E-cadherin plays an important role in morphogenesis and is involved in invasion and metastasis of tumor tissues (21, 22). The negative E-cadherin result suggested that the MPNST in this case was more likely to be invasive. In our study, however, the small sample size of the tumor tissue collected limited the antibodies that could be used in the immunochemical staining. Laminin in nerve fibers is produced by Schwann cells and is present on the axon surface, basolateral membrane, and in Schwann cells (23). A positive laminin result would further confirm that the tumor was of peripheral nerve origin. Alpha-smooth muscle actin (α-SMA) is the actin isoform that predominates within vascular smooth-muscle cells (24). Myogenin and MydoD1 are included in several transcription factors that regulate the differentiation of skeletal muscle (25). Rhabdomyosarcoma was excluded if α-SMA and skeletal muscle markers, myogenin or MydoD1, were negative.

Most MPNSTs in the cranial nerve show hyperintensity on T2WI and FLAIR, hypo- or iso-intensity on T1WI, and a homogeneous enhancement effect of contrast media on MRI (26). However, in this study, the large mass showed mixed hyperintensity on T2WI and FLAIR, and an enhancement effect was noted only around the mass and close to the meninges. In a previous report of a dog, the intracranial MPNST containing necrotic tissue showed an enhancement of the mass margin, with no enhancement of the necrotic area on MRI (6). Our patient may have a similar pathology, but the necrotic area of the tumor was not detected during the histopathological examination. This factor includes not enough samples collected at biopsy. Additionally, intracranial and extracranial lesion formation, with occipital bone erosion, indicated that the tumor was extremely aggressive. These findings differed from those MPNSTs of cranial nerve origin and supported the aggressive nature of the tumor. Therefore, the tumor was presumed to be a subcutaneous MPNST rather than a cranial nerve origin.

Depending on the site of origin, MPNST treatment includes local therapy, such as surgical resection (24, 13, 27), radiation therapy (28, 29), or palliative therapy. However, a radical cure cannot be expected owing to the high local recurrence rate. To date, no effective chemotherapy has been established. In this study, complete surgical resection was expected to be difficult. Additionally, the owner did not want radiation therapy. Eventually, palliative treatment was chosen at the owner's request. However, the patient experienced a rapid decline in his condition and died 19 days after the onset of symptoms with no obvious improvement. The lesion's proximity to the brainstem and increased intracranial pressure are considered crucial factors indicating poor prognosis. In our case, urgent surgical resection for decompression could have prevented further deterioration of the condition and improved short-term prognosis.

Neoplastic diseases affecting the CNS commonly develop in middle and advanced ages and have a subacute or chronic progressive course. Since our patient developed acute paradoxical vestibular disorder at an advanced age, we considered vascular or inflammatory diseases rather than neoplastic diseases as the major differential diagnosis at the time of onset. Brain edema associated with intracranial invasion of the tumor might have caused the acute onset of vestibular disorder. Subsequently, progressively worsening clinical signs after onset were an important finding that suggested a neoplastic disease. Therefore, it is crucial to always consider the possibility of neoplastic diseases and evaluate the subsequent disease course, even when acute vestibular disorder occurs in older animals.

A limitation of this case report is that autopsy could not be performed because the owner's consent was not obtained. From this reason, the exact origin of the tumor and the route of intracranial invasion could not be determined. Furthermore, the small sample size of tumor did not allow for sufficient immunostaining to make a more accurate diagnosis. Hence, in order to make an accurate diagnosis, it is important to collect samples from a number of locations and to be prepared to perform various immunochemical staining as needed.

Data availability statement

The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding author.

Ethics statement

Ethical review and approval was not required for the animal study because ethical review and approval are not required for retrospective case reports. Written informed consent was obtained from the patient's owner for publication of this report. Written informed consent was obtained from the owners for the participation of their animals in this study.

Author contributions

KH, KS, YS, KN, MN, and YN assisted with the diagnosis of this case and participated in clinical case management. KH and YN participated in the review and editing of the manuscript. All authors contributed to the article and approved the submitted version.

Acknowledgments

We thank Dr. Kazuyuki Uchida (Laboratory of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo) for performing the clear immunostaining.

Conflict of interest

Author KN was employed by FUJIFUILM VET Systems Co., Ltd.

The remaining 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.

Publisher's note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

References

1. Suzuki S, Uchida K, Nakayama H. The effects of tumor location on diagnostic criteria for canine malignant peripheral nerve sheath tumors (MPNSTs) and the markers for distinction between canine MPNSTs and canine perivascular wall tumors. Vet Pathol. (2014) 51:722–36. doi: 10.1177/0300985813501336

PubMed Abstract | CrossRef Full Text | Google Scholar

2. Sugiyama A, Morita T, Shimada A, Tsuka T, Okamoto Y, Takeuchi T. Primary malignant peripheral nerve sheath tumor with eosinophilic cytoplasmic globules arising from the greater omentum in a dog. J Vet Med Sci. (2008) 70:739–42. doi: 10.1292/jvms.70.739

PubMed Abstract | CrossRef Full Text | Google Scholar

3. Vom Hagen F, Romkes G, Kershaw O, Eule JC. Malignant peripheral nerve sheath tumor of the third eyelid in a 3-year-old Rhodesian Ridgeback. Clin Case Rep. (2015) 3:50–6. doi: 10.1002/ccr3.146

PubMed Abstract | CrossRef Full Text | Google Scholar

4. Ichikawa M, Suzuki S, Tei M, Nibe K, Uchida K, Ono K, et al. Malignant peripheral nerve sheath tumor originating from the adrenal gland in a dog. J Vet Med Sci. (2018) 18-0431. doi: 10.1292/jvms.18-0431

PubMed Abstract | CrossRef Full Text | Google Scholar

5. Cizinauskas S, Lang J, Maier R, Fatzer R, Jaggy A. Paradoxical vestibular disease with trigeminal nerve-sheath tumor in a dog. Schweiz Arch Tierheilkund. (2001) 143:419–25.

PubMed Abstract | Google Scholar

6. Shihab N, Summers BA, Benigni L, McEvoy AW, Volk HA. Imaging diagnosis-malignant peripheral nerve sheath tumor presenting as an intra-axial brain mass in a young dog. Vet Radiol Ultrasound. (2013) 54:278–82. doi: 10.1111/vru.12011

PubMed Abstract | CrossRef Full Text | Google Scholar

7. Giraud L, Lezmi S, Gomes E, Cauzinille L, A. rare case of malignant vagus nerve sheath tumor presenting with multiple cranial nerve dysfunction in a dog. Can Vet J. (2020) 61:1049–54.

PubMed Abstract | Google Scholar

8. Kishimoto TE, Uchida K, Chambers JK, Kok MK, Son NV, Shiga T, et al. A retrospective survey on canine intracranial tumors between 2007 and 2017. J Vet Med Sci. (2019) 19-0486. doi: 10.1292/jvms.19-0486

PubMed Abstract | CrossRef Full Text | Google Scholar

9. Recio A. de la Fuente C, Pumarola M, Espada Y, Añor S. Magnetic resonance imaging and computed tomographic characteristics of a glioma causing calvarial erosion in a dog. Vet Radiol Ultrasound. (2019) 60:E1–5. doi: 10.1111/vru.12506

PubMed Abstract | CrossRef Full Text | Google Scholar

10. Tsutsumi S, Abe Y, Yasumoto Y, Ito M. Anaplastic pleomorphic xanthoastrocytoma with a component of anaplastic astrocytoma presenting as skull base tumor followed by downward extracranial extension. Case report Neurol Med Chir (Tokyo). (2010) 50:1108–12. doi: 10.2176/nmc.50.1108

PubMed Abstract | CrossRef Full Text | Google Scholar

11. Thakar S, Mohan D, Srinivasa R, Ghosal N, Hegde AS. Intracranial high grade glioma masquerading as a skull base lesion: Report of two unusual cases. J Cancer Res Ther. (2015) 11:1044. doi: 10.4103/0973-1482.158199

PubMed Abstract | CrossRef Full Text | Google Scholar

12. Okada M, Kitagawa M, Shibuya H, Kanayama K, Sato T, Yamamura H, et al. Malignant peripheral nerve sheath tumor arising from the spinal canal in a cat. J Vet Med Sci. (2007) 69:683–6. doi: 10.1292/jvms.69.683

PubMed Abstract | CrossRef Full Text | Google Scholar

13. Briffod C, Hélie P, De Lasalle J, de Lorimier LP, Moreau AR, Alves DA, et al. Retrobulbar malignant peripheral nerve sheath tumor in a golden retriever dog: a challenging diagnosis. Can Vet J. (2018) 59:379–84.

PubMed Abstract | Google Scholar

14. Garg A, Gupta V, Gaikwad SB, Mishra NK, Ojha BK, Chugh M, et al. Scalp malignant peripheral nerve sheath tumor (MPNST) with bony involvement and new bone formation: case report. Clin Neurol Neurosurg. (2004) 106:340–4. doi: 10.1016/j.clineuro.2004.01.003

PubMed Abstract | CrossRef Full Text | Google Scholar

15. Lee JH, Lee MS, Lee BH, Choe DH, Do YS, Kim KH, et al. Rhabdomyosarcoma of the head and neck in adults: MR and CT findings. AJNR Am J Neuroradiol. (1996) 17:1923–8.

PubMed Abstract | Google Scholar

16. Schwab DE, Lepski G, Borchers C, Trautmann K, Paulsen F, Schittenhelm J. Immunohistochemical comparative analysis of GFAP, MAP – 2, NOGO – A, OLIG – 2 and WT – 1 expression in WHO 2016 classified neuroepithelial tumours and their prognostic value. Pathol Res Pract. (2018) 214:15–24. doi: 10.1016/j.prp.2017.12.009

PubMed Abstract | CrossRef Full Text | Google Scholar

17. Ziadi A, Saliba I. Malignant peripheral nerve sheath tumor of intracranial nerve: a case series review. Auris Nasus Larynx. (2010) 37:539–45. doi: 10.1016/j.anl.2010.02.009

PubMed Abstract | CrossRef Full Text | Google Scholar

18. Nonaka D, Chiriboga L, Rubin BP. Sox10: a pan-schwannian and melanocytic marker. Am J Surg Pathol. (2008) 32:1291–8. doi: 10.1097/PAS.0b013e3181658c14

PubMed Abstract | CrossRef Full Text | Google Scholar

19. Higgins RJ, Dickinson PJ, Bollen AD, Siso-Llonch S. Tumors of the nervous system. In: Tumors in Domestic Animals 5th, ed. Hoboken, NJ: Blackwell Publishing (2017). p. 881–9.

Google Scholar

20. Roccabianca P, Schulman FY, Avallone G, Foster RA, Scruggs JL, Dittmer K. Tumors of Soft Tissue. In: Surgical Pathology of Tumors of Domestic Animals: Volume 3. Thompson Foundation (2020). p. 59–63.

Google Scholar

21. Frixen UH, Behrens J, Sachs M, Eberle G, Voss B, Warda A, et al. E-cadherin-mediated cell-cell adhesion prevents invasiveness of human carcinoma cells. J Cell Biol. (1991) 113:173–85. doi: 10.1083/jcb.113.1.173

PubMed Abstract | CrossRef Full Text | Google Scholar

22. Umbas R, Schalken JA, Aalders TW, Carter BS, Karthaus HFM, Schaafsma HE, et al. Expression of the cellular adhesion molecule E-cadherin is reduced or absent in high grade prostate cancer. Cancer Res. (1992) 52:5104–09.

PubMed Abstract | Google Scholar

23. Kuechere-Ehret A, Graeber MB, Edgar D, Thoenen H, Kreutzberg GW. Immunoelectron microscopic localization of laminin in normal and regenerating mouse sciatic nerve. J Neurocytol. (1990) 19:101–9. doi: 10.1007/BF01188442

PubMed Abstract | CrossRef Full Text | Google Scholar

24. Annegowda VM, Devi HU, Rao K, Smitha T, Sheethal HS, Smitha A. Immunohistochemical study of alpha-smooth muscle actin in odontogenic cysts and tumors. J Oral Maxillofac Pathol. (2018) 22:188–92. doi: 10.4103/jomfp.JOMFP_31_18

PubMed Abstract | CrossRef Full Text | Google Scholar

25. Sebire NJ, Malone M. Myogenin and MyoD1 expression in paediatric rhabdomyosarcomas. J Clin Pathol. (2003) 56:412–6. doi: 10.1136/jcp.56.6.412

PubMed Abstract | CrossRef Full Text | Google Scholar

26. Mai W. Cranial nerve diseases. In: Diagnostic MRI in Dogs and Cats. Boca Raton, FL: CRC Press (2018). p. 326–43 doi: 10.1201/9781315121055

CrossRef Full Text | Google Scholar

27. Gibson AD, Davies E, Lara-Garcia A, Lafuente P. Palliative epineurotomy for focal radial malignant peripheral nerve sheath tumor in a dog. J Am Anim Hosp Assoc. (2016) 52:330–4. doi: 10.5326/JAAHA-MS-6336

PubMed Abstract | CrossRef Full Text | Google Scholar

28. Hansen KS, Zwingenberger AL, Theon AP, Pfeiffer I, Kent MS. Treatment of MRI-diagnosed trigeminal peripheral nerve sheath tumors by stereotactic radiotherapy in dogs. J Vet Intern Med. (2016) 30:1112–20. doi: 10.1111/jvim.13970

PubMed Abstract | CrossRef Full Text | Google Scholar

29. Swift KE, McGrath S, Nolan MW, Young M, Reese M, Rao S, et al. Clinical and imaging findings, treatments, and outcomes in 27 dogs with imaging diagnosed trigeminal nerve sheath tumors: a multi-center study. Vet Radiol Ultrasound. (2017) 58:679–89. doi: 10.1111/vru.12535

PubMed Abstract | CrossRef Full Text | Google Scholar

Keywords: peripheral nerve sheath tumor, extracranial tumor, intracranial invasion, malignant lesion, osteolysis, occipital region

Citation: Hidari K, Nakamoto Y, Sakurai K, Sakurai Y, Nibe K and Nakamoto M (2022) Case report: Presumptive subcutaneous malignant peripheral nerve sheath tumor with intracranial invasion and osteolysis in the posterior fossa of a dog. Front. Vet. Sci. 9:977099. doi: 10.3389/fvets.2022.977099

Received: 24 June 2022; Accepted: 12 October 2022;
Published: 08 November 2022.

Edited by:

Marco Bernardini, University of Padua, Italy

Reviewed by:

Silvia Siso, Codiak BioSciences, United States
Ezio Bianchi, University of Parma, Italy

Copyright © 2022 Hidari, Nakamoto, Sakurai, Sakurai, Nibe and Nakamoto. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Yuya Nakamoto, neuro_vets@yahoo.co.jp

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.