BackgroundPrimary adrenal melanoma is extremely rare, currently with 23 cases in a literature review. 1 Typically, patients present with abdominal symptoms such as flank pain 2-5 and weight loss. 3,[5][6][7][8] In this paper, we present a case of primary adrenal melanoma, which initially presented with weight loss, abdominal bloating, distention, intermittent diarrhea, and flatulence, but no flank pain.
Case reviewAn 82-year-old male with a history of robotic-assisted laparoscopic prostatectomy for pT2N0 Gleason score 3+4 prostate cancer presented with abdominal bloating, distention, intermittent diarrhea, flatulence, and weight loss. The patient's father had lung cancer, and his mother had a stroke. Under the working diagnosis of irritable bowel syndrome, the patient failed to improve on a gluten-free diet. Subsequently, computed tomography (CT) virtual colonoscopy discovered a large right upper pole renal mass without masses suggestive of primary colon carcinoma. A followup dedicated CT of the abdomen and pelvis confirmed a large 9.5 cm×7.2 cm×9.2 cm mass emanating from either the upper pole of the right kidney or the right adrenal gland (Figure 1). A nuclear bone scan and chest CT were negative for metastatic disease. A positron emission tomography scan showed a hypermetabolic mass from the right adrenal gland, with additional nonspecific hypermetabolic mediastinal and bilateral hilar lymph nodes (Figure 2). There was no biochemical evidence of a functional adrenal mass. His prostate serum antigen was undetectable. The patient had a Karnowski Performance Scale Index of 80, which signifies normal activity with effort with some signs or symptoms of disease. The patient reported no signs of vision change, and thus an ocular melanoma origin was not suspected. Furthermore, the patient reported no neurological deficits to suspect a leptomeningeal origin.