Benign Schwannoma

Definition 1

A slowly growing, benign, usually encapsulated tumor, composed of neoplastic differentiated Schwann cells. Although it can affect any age, it is more commonly seen in the fourth to sixth decades of life. It usually occurs in the peripheral nerves of the head and neck regions and the extensor aspects of the extremities. It rarely undergoes malignant transformation. (NCI Thesaurus)

Definition 2

(shwah-NO-ma) (NCI Dictionary)

Definition 3

A tumor of the peripheral nervous system that arises in the nerve sheath (protective covering). It is almost always benign, but rare malignant schwannomas have been reported. (NCI Dictionary)

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