Uterus-like mass in association with neural tube defect: a case report and review of the literature.

Uterus-like mass is an extremely rare choristoma of müllerian origin arising in association with neural tube defects. In this article, we describe the case of a 9-year-old girl with spina bifida, a mass lesion within the conus, and a subcutaneous lipoma in the lumbosacral region. Histopathological examination of the conus lesion revealed a uterus-like structure comprising of endometrial glands and stroma surrounded by fascicles of smooth muscle. This case differs from the few previously described cases in absence of neurological symptoms and early age at diagnosis. Thorough histopathological examination of resected tissue is therefore recommended for the diagnosis of this rare entity, as it may not have a typical presentation in all instances.