Gastrointestinal Stromal Tumor of the Prostate: Staging and Evaluation of Response to Therapy With 18F-FDG PET/CT

Abstract A 49-year-old man presented for routine general physical examination was found with an enlarged prostate gland without associated symptoms. Ultrasound followed by computed tomography (CT) of abdomen and pelvis confirmed a markedly enlarged heterogeneous prostate gland. Subsequently, a staging flourine-18 fluorodeoxyglucose (18F-FDG) positron emission tomography (PET/CT) scan revealed intensely FDG-avid mass involving the prostate, which was biopsied as gastrointestinal stromal tumor (GIST). The patient was treated with imatinib and a follow-up PET/CT scan showed complete metabolic response. 18F-FDG PET/CT scan is useful in staging and follow-up of this very rare extragastrointestinal stromal tumor (EGIST). Received for publication September 25, 2017; revision accepted October 31, 2017. Conflicts of interest and sources of funding: none declared. Correspondence to: Department of Nuclear Medicine, PET/CT Unit, Gulf International Cancer Center, P.O. Box 5882, Abu Dhabi, UAE. E-mail: yazan.alabed@gmail.com. Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.

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