Solution: Adenomatoid tumors of the epididymis are uncommon tumors that present as a paratesticular mass. The majority of paratesticular masses are lipomas of the spermatic cord. Adenomatoid tumors are next most common with a long list of other possibilities (sarcomas of the epididymis being the most important consideration). Adenomatoid tumors are benign slow growing mesothelial neoplasms that present in the 2nd-4th decade and have epithelial-like cells and a fibrous stroma. They are most frequently seen in the epididymal tail (like this one) and are seen as a well marginated mass with echogenicity equal to or greater than the adjacent testicle. These tumors are generally treated based upon US findings, so MRI is unusual, but what has been reported is something similar to this case, which is high T2 signal with low signal bands, low to intermediate T1 signal and some mild enhancement of the bands. These are usually treated with local excision and have no significant risk of recurrence.