Fig. 20

Cystic dysplasia of the rete testis in two different patients with known ipsilateral multicystic dysplastic kidney. a A 3-year-old boy with palpable right testicular mass. Gray scale testis US showed well-defined multicystic lesions within the right mediastinum testis. The lesion contains serpiginous tubular anechoic areas with intervening echogenic septations (arrowheads). No internal vascularity was detected on color flow Doppler US exam (not shown). Cystic dysplasia of rete testis was considered due to patient demographics and history. The lesion was stable on his last follow-up US exam 2 years after initial presentation. b A 7-year-old boy presenting with left testicular swelling. Gray scale US image shows a large multicystic lesion almost completely replacing the left testis parenchyma (arrows). Again the patient demographics, history and imaging findings were consistent with cystic dysplasia of the rete testis. Findings were stable on serial follow-up US exams