Malignant transformation in a hybrid schwannoma/perineurioma: Addition to the spectrum of a malignant peripheral nerve sheath tumor

Benign nerve sheath tumors include schwannomas, neurofibromas and perineuriomas.The malignant counterpart of a nerve sheath tumor is designated as a malignant peripheral nerve sheath tumor (MPNST).Lately, benign nerve sheath tumors comprising more than one component have been described, including hybrid schwannomas/perineuriomas.However, malignant

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