Tubular ectasia of rete testis. A 57-year-old male with a history of bilateral vasectomy now presenting with a right testicular mass. Physical exam revealed bilateral small testes with a questionable palpable mass on the right side. Gray scale US image demonstrates multiple cystic-tubular anechoic structures completely replacing the mediastinum testis (asterisk) in the right. There were also similar findings in the left testis, to a lesser extent (not shown). Based on patient’s history the findings are consistent with extensive rete testis ectasia in the right testis. Follow-up imaging studies demonstrated stability of the findings over 2 years (not shown)