Fine needle aspiration cytology of a primary malignant peripheral nerve sheath tumor arising in the parotid gland: a case report.

Background: Malignant peripheral nerve sheath tumor (MPNST) is an uncommon mesenchymal neoplasm showing nerve sheath differentiation, usually arising in large nerves of the trunk and extremities. Primary location in the parotid gland is rare. We describe fine needle aspiration (FNA) findings in a case of MPNST in the parotid gland.