Testicular cysts have been considered rare. However, of 307 men who underwent high-resolution ultrasonography (10 MHz) of the scrotum, 30 (9.8%) had testicular cysts. Thirty-three testes were involved, 23 with single cysts, eight with clusters of multiple tiny cysts, and two with more than one focus of cyst. One cyst was aspirated intraoperatively, and one cyst of the tunica albuginea was proved at surgery. Eighty cadaveric testes were scanned also, and cysts were found in one. In two cases, the pathologic report, reviewed retrospectively, failed to mention the cyst, but these cysts could have been overlooked. Further work is needed to determine when or if these testicular lesions need follow-up and what significance they have, if any.