From Nonfunctioning Adrenocortical Cancer to Biochemically Silent Paraganglioma Associated with Mutation: An Uncommon Presentation of a Patient with a Retroperitoneal Mass.

The combination of clinical characteristics and diagnostic exams including imaging, laboratory, and molecular tests help in the differential diagnosis of retroperitoneal lesions. We report a 41-year-old male with a metastatic retroperitoneal lesion with atypical characteristics, displaying pathological findings consistent with both nonsecretory pheochromocytomas/paragangliomas and adrenal cortex carcinoma. The patient was examined for abdominal pain, weight loss, and hypertension.