摘要:Most gluteal teratomas reported in the literature are lateralised sacrococcygeal teratomas. These tumours derive from more than one embryonic germ cell layer, and are usually diagnosed in infancy. We report a case of a large unilateral teratoma protruding through the left gluteus skin of a 2-year-old girl, anterior to the sacrum and coccyx. A complete excision of the tumour was achieved.