Radiation-Induced Glandular Malignant Peripheral Nerve Sheath Tumor.

Malignant peripheral nerve sheath tumors (MPNSTs) are aggressive soft-tissue tumors. They can occur in patients with neurofibromatosis type-1 (NF-1) or as sporadic tumors. Only 10% of MPNSTs are radiation induced. Divergent differentiation in MPNSTs can occur in 15% of cases and may include cartilage, bone, skeletal muscle, blood vessels, and very rarely well-formed glands, the latter typically described in NF-1-associated MPNSTs. We report an exceedingly rare case of radiation induced glandular MPNST arising in a neurofibroma of the femoral nerve in a patient previously irradiated for endometrial carcinoma.