A teratorna (C'reek teratos [):IonsterJ and onkoma [a swelling]) is a true tumor or neoplasm composed of multiple tissues of kinds foreign to the parts in which it arises, take different forms, either solid or cystic, and arise in an immediately prexial median or paramedian location. The retroperitoneal teratoma is a rare condition in only 10% of all retroperitoneal primary neoplasms. Among 10%, the incidence of malignant degeneration has been reported to be from 6 to 10 percent and mature solid retropertioneal teratoma is about 90 percent. About 200 cases has been recorded since Morgargnis first description in 1961. A 24-year-old woman complained left upper guadrant palpable mass. Roentgen study revealed typical conglomerated frame-like calcification in left abdomen. In addition to reporting a case of mature solid retroperioneal teratoma, we will present a review of the literature available on this subject.