Submucosal dermoid cyst of the rectum: Report of a case

Despite the relatively common incidence of sacrococcygeal dermoids, rectal cysts are uncommon. We report the case of a submucosal dermoid cyst occurri ng in the rectum, A 30-year-old woman visited the Gynecology Department bec ause of pregnancy. A pelvic tumor was accidentally found during the checkup after miscarriage. A barium enema showed an anterior shift of the rectum b y the presence of the tumor. Computed tomography and magnetic resonance ima ging revealed a tumor located posterior to the rectum occupying almost the entire pelvic cavity, and the tumor was resected, The tumor was located in the submucosal layer of the posterior rectal wall and was well circumscribe d, The resected tumor was a cyst entirely covered with a fibrous and firm c apsule, which was filled with an amorphous white creamy substance. The hist ological findings showed the cyst consisting of a keratinizing stratified s quamous epithelium with sebaceous gland and hair follicles, which was compa tible with benign cystic teratoma, Primary rectal teratoma is very rare and only 36 cases have been reported in the literature worldwide. Furthermore, while the majority of cases were polypoid-shaped dermoid cysts protruding into the rectal lumen, only 3 cases were submucosal dermoid cysts. Therefor e, such cases are considered to be extremely rare.