A Case of Incidentally Detected Silent Adrenal Pheochromocytoma, Mimicking as an Intraperitoneal Tumor With Unusual Computed Tomography Findings

Abstract

Pheochromocytoma is a rare functional adrenal tumor often producing catecholamines. Such secretion may induce hypertension, tachycardia or cardiac related symptoms. However, pheochromocytoma can present as an asymptomatic adrenal incidentaloma which may be difficult to detect; thus, leading to delay in proper surgical treatment. We report a 39-year-old female patient who presented with gastric gastrointestinal stromal tumor-like appearance on computed tomography, which was identified as a left retroperitoneal adrenal tumor after initial surgery. Before the second surgery, adrenal tumor shrinkage was detected without any causable event. The final pathology was confirmed as pheochromocytoma after the second surgery.