Anorectal teratoma in an adult woman.

We present the case of a 21-year-old woman referred to us with the diagnosis of a pelvic mass originating in the lower rectum. Following preoperative assessment she underwent surgery from a posterior approach. The pathology of the removed mass revealed an extremely rare rectal tumor--an anorectal teratoma of the mature type. We describe the successful surgical treatment, together with radiological, microscopic and perioperative appearance.