"Giant" terminal myelocystocele: A rare variant of spinal dysraphism.

Terminal myelocystocele (TMC) is a rare form of spinal dysraphism. They constitute approximately 5% of skin covered lumbosacral masses. The TMC is composed of a low-lying conus medullaris with cystic dilatation of caudal central canal and a surrounding meningocele that extends from the conus to the skin. A 2-year-old female child presented with a large lumbosacral mass and weakness of both lower limbs since birth. Magnetic resonance imaging revealed a giant TMC. The child was operated on successfully. This is an interesting and rare case of "giant" TMC with partial sacral agenesis.