Malignant triton tumor (MTT) is a rare aggressive subtype of malignant peripheral nerve sheath tumor (MPNST) characterized histopathologically by focal rhabdomyoblastic differentiation. The disease is malignant triton tumor (MONDO_0016757, a Monarch Disease Ontology id). Also known as: MPNST with rhabdomyoblastic differentiation, MPNST with rhabdomyosarcoma, MPNST with rhabdomyosarcomatous differentiation, MTT, malignant Triton tumor, malignant Triton tumour, malignant neoplasm of peripheral nerve sheath with rhabdomyosarcoma, malignant neoplasm of the peripheral nerve sheath with rhabdomyosarcoma.