Detection of an Adrenal Adenoma on 18F-Fluorocholine PET/CT in a Patient with Prostate Cancer

18F-Fluorocholine PET/CT is a valuable imaging tool in prostate cancer evaluation, especially for detecting biochemical recurrence.However, false-positive results, including benign adrenal adenomas, may occur.We present a case of a 62-year-old male with treated prostate cancer, who underwent 18F-FCH PET/CT due to biochemical recurrence.The scan showed focal uptake in the prostatic bed but also unexpectedly identified a 13x14 mm hypodense mass in the left adrenal gland.MRI suggested an adrenocortical adenoma, which was confirmed histologically.While adrenal radiotracer uptake is well-documented with other radiotracers, 18F-FCH role in characterizing adrenal lesions remains underexplored.This case raises the potential for 18F-FCH PET/CT to help distinguish benign from malignant adrenal tumors, warranting further investigation.