Tumors of the sacrum.

摘要

Tumors of the sacrum are rare. Metastases are the most common malignant tumors of the sacrum, derived from lung, breast, kidney, prostate, head and neck, gastrointestinal or skin (melanoma) cancers1'2; these will not be discussed further. Primary benign and malignant tumors of the sacrum may arise from bone or neural elements, or the bone marrow in cases of hematological malignancies. Ten percent of all benign tumors or pseudotumors involve the sacrum, including giant cell tumors (60% of cases), aneurysmal bone cysts (4%) and osteo-blastomas. Six percent of all malignant bone tumors involve the sacrum, including chordomas (50% of cases), lympho-mas (9%) and multiple myelomas (9%), Ewing's sarcoma in children (8%), chon-drosarcomas in adults, and osteosarcomas. Other benign and malignant tumors of the sacrum are exceptional.