“…The main differential diagnosis is Ewing's sarcoma/primary neuroectodermal tumor . NUT carcinoma can also be confused with rhabdomyosarcoma, biphasic forms of synovial sarcoma, undifferentiated carcinomas of the nasopharynx, carcinoma of the salivary glands, small cell desmoplastic tumors, or rhabdoid tumors. Case NMC 7 presented an unusual immunological profile with negative staining for several anticytokeratin antibodies with a particularly broad spectrum (KL1, AE1‐AE3, CK7, CK20, CK8‐18) and the presence of myeloid markers (CD45, CD68, myeloperoxidase, TdT, CD15).…”