[MRI findings in a testicular epidermoid cyst: a case report].

A 21-year-old man was admitted with a painless mass in the left testis. Physical examination revealed a firm, small-finger sized, mass lesion with a smooth surface in the left testis. The ultrasonographic appearance was a hypoechoic lesion with an echogenic rim in the left testis. Magnetic resonance imaging (MRI) findings showed the echogenic rim to be a low-signal zone on both T1 and T2-weighted images. The center, on T2-weighted images, had a low signal intensity, with peripheral high signal intensity. Under a preoperative diagnosis of epidermoid cyst, the mass was resected surgically with preservation of the testis. Histopathological diagnosis confirmed an epidermoid cyst. Preoperative ultrasonographic and MRI findings suggested a benign lesion, thus permitting preservation of the testis.