Histologic type | Benign | Intermediate, locally aggressive | Intermediate, rarely metastasizing | Malignant |
---|---|---|---|---|
Adipocytic | Lipoma and its variants (lipoblastoma, hibernoma, lipomatosis) | Atypical lipomatous tumor, well-differentiated liposarcoma | … | Liposarcoma |
Fibroblastic/myofibroblastic | Fibromatosis colli, myofibroma, giant cell angiofibroma | Desmoid-type fibromatosis | Solitary fibrous tumor hemangio-pericytoma, inflammatory myofibroblastic tumor (inflammatory pseudotumor) | Fibrosarcoma |
So-called fibrohistiocytic | Benign fibrous histiocytoma, diffuse-type giant cell tumor (pigmented villonodular synovitis) | … | Giant cell tumor of soft tissues | Malignant fibrous histiocytoma (undifferentiated pleomorphic sarcoma) |
Skeletal muscle | Rhabdomyoma | … | … | Rhabdomyosarcoma |
Smooth muscle | Leiomyoma, angioleiomyoma | … | … | Leiomyosarcoma |
Vascular | Hemangioma, lymphangioma | Kaposiform hemangioendothelioma | Kaposi sarcoma | Angiosarcoma |
Perivascular | Glomus tumor, myopericytoma | … | … | Malignant glomus tumor |
Chondro-osseous | Soft tissue chondroma | … | … | Mesenchymal chondrosarcoma, extraskeletal osteosarcoma |
Uncertain differentiation | Myxoma | … | Ossifying fibro-myxoid tumor | Synovial sarcoma, alveolar soft part sarcoma, primitive neuroectodermal tumor, Ewing sarcoma |