MRI OF RADIATION-INDUCED PROSTATE SARCOMA

A patient with a history of pelvic radiation therapy for seminoma pres ented with a prostatic tumor, which appeared predominantly of high sig nal intensity on T2-weighted magnetic resonance images; low-signal-int ensity tissue also extended to the pelvic sidewall. At surgical pathol ogy, the tumor was determined to be radiation-induced sarcoma of the p rostate, and the extraprostatic tissue was postradiation fibrosis.