neurilemmoma


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Related to neurilemmoma: neurofibroma, schwannoma

neurilemmoma

schwan·no·ma

(shwah-nō'mă)
A benign, encapsulated neoplasm in which the fundamental component is structurally identical to a syncytium of Schwann cells; the neoplastic cells proliferate within the endoneurium, and the perineurium forms the capsule. The neoplasm may originate from a peripheral or sympathetic nerve, or from various cranial nerves, particularly the eighth nerve; when the nerve is small, it is usually found (if at all) in the capsule of the neoplasm; if the nerve is large, the neurilemmoma may develop within the sheath of the nerve, the fibers of which may then spread over the surface of the capsule as the neoplasm enlarges. Microscopically, neurilemmoma is composed of combinations of two patterns, Antoni types A and B, either of which may be predominant.
See also: neurofibroma
Synonym(s): neurilemmoma.
[Theodor Schwann + -oma]

neurilemmoma

A benign tumour of NEURILEMMA (Schwann cells) that may occur in any peripheral or CRANIAL NERVE or in a nerve of the sympathetic nervous system. Although non-malignant, neurilemmomas of such nerves as the acoustic nerve can be dangerous.

schwan·no·ma

(shwah-nō'mă)
A benign, encapsulated neoplasm in which the fundamental component is structurally identical to a syncytium of Schwann cells.
Synonym(s): neurilemmoma.

neurilemmoma

a tumor of a peripheral nerve sheath (neurilemma); called also schwannoma. Occur as small subcutaneous tumors on the head of goldfish.

Patient discussion about neurilemmoma

Q. Anybody familiar with schwannoma?

A. A schwannoma is a kind of tumor originating from the Schwann cells. The insulating myelin sheath which covers peripheral nerves is produced by the Schwann cells. Hence, one kind of tumor originating from the Schwann cells is called a schwannoma.

Schwannomas are very homogeneous tumors consisting only of Schwann cells. The tumor cells always stay on the outside of the nerve, but the tumor itself may either push the nerve aside and/or up against a bony structure (thereby possibly causing damage). Schwannomas are relatively slow growing. For reasons not yet understood, schwannomas are mostly benign and less than 1% become malignant (degenerate into cancer). This form of cancer is known as malignant peripheral nerve sheath tumour or malignant Schwannoma or neurofibrosarcoma.

Schwannomas can arise from a genetic disorder called neurofibromatosis.

More discussions about neurilemmoma
References in periodicals archive ?
The prognosis associated with neurilemmoma is excellent, with symptomatic resolution.
Our case was a rare presentation of a nasal neurilemmoma in a child.
Therefore, we believe ours is the first report of a neurilemmoma of the nasal dorsum in a pediatric patient.
Adequate removal is essential to prevent recurrence, yet a cautious technique should be employed because of the close proximity to the nerve from which the neurilemmoma originates.
The histopathology report identified the specimen as a neurilemmoma.
The diagnosis of neurilemmoma is established only by histopathology.
In conclusion, neurilemmoma is not usually considered as an initial diagnosis in a case of a painless, slowly growing nodule or swelling in and around the oral cavity, and it may not even be included in the differential diagnosis.
Immunohistochemically, the spindle cells showed diffuse positivity for S-100 protein, which helped confirm the diagnosis of a laryngeal neurilemmoma.
One study showed that only 1 of 722 benign tumors of the larynx was a neurilemmoma.
As a laryngeal neurilemmoma expands, it projects into the laryngeal airway.
Multiple neurilemmomas of the median and ulnar nerves with a communicating branch in the same upper extremity.
Multiple cutaneous neurilemmomas as a skin manifestation of neurilemmomatosis.