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Visualization of the genitalia in renal transplant evaluation.

An interesting finding was observed in a 40-year-old man on an initial transplant assessment with Tc-99m DTPA. The tracer (400 MBq; 11 mCi) was injected as a bolus, and dynamic acquisition was performed at a frame rate of 1 second x 30, 20 seconds x 5, and 60 seconds x 25 with a single-head gamma camera. The area of abnormal uptake corresponded to the genitalia, and the time scale of events excluded scrotal urinoma or lymphocele. Physical examination did not reveal any local abnormality to explain the increased genital blood pooling. The possible explanation for this finding is sexual stimulation resulting in an erection during the study.