Ralph Wendt ^* Marie Heller Daniel Härtwig Sven Oliver Ullmann Heike Bisanz Daniela Geister Luisa Mantovani Ulrike Hoffmann

• St. Georg Hospital, Leipzig, Germany

Background: Malignant hypercalcemia is usually caused by osteolytic processes of metastases, production of parathormone-related peptide or secretion of 1,25-dihydroxyvitamin D. Ectopic PTH (parathyroid hormone) production by malignancy is very unusual. Methods: Case report and review of the literature Results: We present a case of a malignant hypercalcemia with a presentation that mimicked primary hyperparathyroidism in a patient with endometrial carcinoma. Finally, ectopic production of PTH by a rapidly progressive neuroendocrine tumor was proven. Systematic literature review revealed ectopic PTH production by malignancies as an extremely rare cause of hypercalcemia and that most case were initially misdiagnosed as primary hyperparathyroidism and underwent unnecessary surgical neck exploration in almost all cases. Conclusion: In patients even with a suggestive constellation of primary hyperparathyroidism, an ectopic paraneoplastic PTH source should be considered if the localization diagnostics are without abnormalities or if the PTH values are unusually high. Concomitant elevated LDH levels should also raise concern about an ectopic malignant source.