MUC1 and malignant peripheral nerve sheath tumor: We caution readers against assuming any spindle cell tumor with epithelial immunolabeling to be synovial sarcoma, as 3/6 of our MPNST cases had CK and EMA expression, which is comparable to previous studies and may have been due to cross-reactivity with schwannian components [12], and one must be cognizant of MPNST subtypes (epithelial and perineurial) with an epithelial immunophenotype.