Adenomatoid Tumor of the Epididymis

Adenomatoid tumors are the most common tumors of the epididymis (although rare overall) and have a predilection for the lower pole of the epididymis. They are usually unilateral (more often on the left) and most commonly affect men older than 20 years of age. 30% of patients present with pain.

Ultrasound findings are nonspecific and variable. While most are isoechoic relative to the adjacent normal epididymis, predominantly cystic adenomatoid tumors may also be seen. In contrast to the usually round testicular adenomatoid tumors, adenomatoid tumors of the epididymis are usually oval.

Differential considerations include subclinical chronic infection and sperm cell granuloma post vasectomy.

References

Akbar SA, Sayyed TA, Jafri SZ, Hasteh F, Neill JS. Multimodality imaging of paratesticular neoplasms and their rare mimics. Radiographics. 2003 Nov-Dec;23(6):1461-76.