Intrarenal epidermal cyst.

Although renal cystic formations are seen frequently and arise with diverse symptoms, epidermal cyst is a very unusual cause of renal masses. A50-year-old woman was admitted to our clinic because of lumbar pain, hematuria and dysuria that lasted for 2 months. An atrophic and dysfunctional right kidney was identified. Transperitoneal laparoscopic simple nephrectomy was performed. Microscopic examination revealed typical findings of epidermoid cyst. According to the literature, intrarenal epidermal cysts are usually treated by nephrectomy because they cannot be differentiated from renal masses. To the best of our knowledge, this case report of an epidermoid cyst located in the renal parenchyma of a female patient is the first in the English-language literature.