title: Incidental Bilateral Renal Oncocytoma in a Patient with Metastatic Carcinoma of Unknown Primary: a Pitfall on (18)F-FDG PET/CT.
abstract: Bilateral renal masses are uncommon but can raise a strong suspicion of primary or secondary malignancy, especially during the initial work-up of an oncology patient. Renal oncocytomas are benign renal tumors that are commonly discovered incidentally on diagnostic imaging with a small percentage occurring bilaterally. Although (18)F-FDG uptake in renal oncocytomas has been described, a case of a bilateral (18)F-FDG-avid renal oncocytoma has not been previously reported in the literature. A variety of malignant causes of bilateral (18)F-FDG positive renal masses are known, however it is important to include this benign etiology in the differential diagnosis. We report an unusual case of an incidental bilateral renal oncocytoma evaluated with contrast enhanced CT and (18)F-FDG PET/CT.
authors.affiliation: Department of Nuclear Medicine, Brandon Regional Health Centre, 150 McTavish Ave E, Brandon, MB R7A 2B3 Canada.
authors.forename: William
authors.initials: W
authors.lastname: Makis
authors.affiliation: Department of Nuclear Medicine, Royal Victoria Hospital, McGill University Health Centre, 687 Pine Ave West, Floor M2, Montreal, Quebec H3A 1A1 Canada.
authors.forename: Anthony
authors.initials: A
authors.lastname: Ciarallo
authors.affiliation: Department of Nuclear Medicine, Royal Victoria Hospital, McGill University Health Centre, 687 Pine Ave West, Floor M2, Montreal, Quebec H3A 1A1 Canada.
authors.forename: Javier-A
authors.initials: JA
authors.lastname: Novales-Diaz
authors.affiliation: Department of Nuclear Medicine, Royal Victoria Hospital, McGill University Health Centre, 687 Pine Ave West, Floor M2, Montreal, Quebec H3A 1A1 Canada.
authors.forename: Robert
authors.initials: R
authors.lastname: Lisbona
keywords: Bilateral renal mass; Bilateral renal oncocytoma; FDG; PET/CT