BCOR and spindle cell sarcoma: This heterogeneous group included two cases of infantile myofibromatosis and single cases of BCOR-rearranged undifferentiated sarcoma, leiomyosarcoma, low-grade soft-tissue sarcoma, synovial sarcoma, low-grade spindle cell sarcoma, “poorly differentiated round and spindle cell sarcoma,” “infantile rhabdomyofibrosarcoma,” malignant rhabdoid tumor, hemangiopericytoma, histiocytoma, and malignant peripheral nerve sheath tumor.