a rare case of sacrococcygeal teratoma with medullar invasion

Background and importance: sacrococcygeal teratoma (sct) with medular invasion is rare.case presentation: we report a case of an 11month male infant, with no prenatal history of any abnormality, presenting since birth, a mass in the buttock extended to retrorectum associated with a right side hypotonic limb and monoplegia. medullar and abdominal pelvic magnetic resonance imaging (mri) showed a sacrococcygeal tissue mass and intradural lumbosacral invasion with a high level of alphafetoprotein. surgical excision was done successfully with an uneventful followup.conclusion: despite of the intradural invasion, those sct are in major cases mature and present low risk of malignancy or recurrence.