USP6 and spindle cell neoplasm: The translocation of COL3A1 had been reported as a rare partner fusing to PLAG1-rearranged neoplasms (including lipoblastoma and unclassified spindle cell neoplasm) and USP6-rearranged neoplasms (including cranial fasciitis, cellular fibroma of the tendon sheath, and unclassified benign myofibroblastic tumor).