Fig. 1

Malignant tumors Chordoma (316, 44.1%); Chondrosarcoma (74, 10.3%); Multiple myeloma (53, 7.4%); Malignant peripheral nerve sheath tumor (47, 6.6%); Ewing sarcoma (47, 6.6%); Osteosarcoma (40, 5.6%); Lymphoma (35, 4.9%); Solitary fibrous tumor (20, 2.8%); Spindle cell undifferentiated sarcoma (17, 2.4%); Malignant giant cell tumor (17, 2.4%); Malignant teratoma (11, 1.5%); Liposarcoma (10, 1.4%); Ependymoma (4, 0.6%); Angiosarcoma (3, 0.4%); Fibrosarcoma (3, 0.4%); Hemangioendothelima (3, 0.4%); Myelocytic sarcoma (3, 0.4%); Yolk sac tumor (3, 0.4%); Leiomyosarcoma (2, 0.3%); Alveolar soft part sarcoma (2, 0.3%); Leukemia (2, 0.3%); Epithelioid sarcoma (1, 0.1%); Granulocyte sarcoma (1, 0.1%); Myofibroblastic sarcoma (1, 0.1%); Synovial sarcoma (1, 0.1%) Benign tumors and tumor-like lesions Giant cell tumor (205, 30.6%); Neurofibroma (155, 23.2%); Schwannoma (119, 17.8%); Tuberculosis (24, 3.6%); Teratoma (23, 3.4%); Sacral canal cysts (22, 3.3%); Epidermoid cyst (21, 3.1%); Hemangioma (14, 2.1%); Meningeal cysts (13, 1.9%); Primary aneurysmal bone cyst (10, 1.5%); Fibrous dysplasia (9, 1.3%); Osteoblastoma (9, 1.3%); Eosinophilic granuloma (7, 1.0%); Simple bone cyst (7, 1.0%); Spinal meningioma (5, 0.7%); Gut-tail cyst (4, 0.6%); Benign fibrous histiocytoma (4, 0.6%); Fibromatosis (3, 0.4%); Diffuse giant cell tumor of tendon sheath (3, 0.4%); Chondroblastoma (3, 0.4%); Lipoma (2, 0.3%); Phosphouria stromal tumor (2, 0.3%); Osteoidosteoma (2, 0.3%); Liomyoma (1, 0.1%); Paget disease (1, 0.1%); Osteochondroma (1, 0.1%)