A rare case of clinically and biochemically silent giant right pheochromocytoma: case report and review of literature.

Non-secreting pheochromocytomas are rare adrenal tumours. We report the case of a clinically and biochemically silent giant pheochromocytoma that presented as bilateral pulmonary embolisms. Successful surgical resection was performed. Multiple endocrine neoplasia 2 syndrome and neurofibromatosis type 1 were clinically excluded. Subsequent DNA analysis of the succinate dehydrogenase complex subunits B and D (SDHB and SDHD), and Von Hippel-Lindau (VHL) genes revealed no mutations.