Asymmetric FDG Uptake in the Testes: A Case Report

Received 1/22/2007; revised 2/8/2007; accepted 2/9/2007. For correspondence or reprints contact: Wan-Yu Lin, M.D., Department of Nuclear Medicine, Taichung Veterans General Hospital, 160 Section 3, Taichung Harbor Road, Taichung 407, Taiwan. Tel: (886)4-23741349, Fax: (886)4-23741348, E-mail: [email protected] We present an asymptomatic 51-year-old man who underwent a FDG-PET scan as a part of health checkup for cancer screening. The FDG-PET scan showed higher radioactivity in the left testis than in the right one and left testicular disorder was thus suspected. Following examinations of testes ruled out diseased left testis and revealed an atrophic right testis, which resulted in a decrease in FDG uptake and asymmetric picture. To our knowledge, testicular atrophy causing decrease in FDG uptake has not yet been reported. In reading a picture of asymmetric testicular FDG activity, the possibility of unilateral atrophic testis that absorbs less radioactivity should be kept in mind.