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Schwannoma

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Schwannoma
Peripheral schwannoma Antoni type A (1).JPG
Schwannoma
ICD-10C724
ICD-9225.1
DiseasesDB33713
MeSHD009442

A schwannoma (also known as an "acoustic neuroma,"[1] "neurilemmoma,"[2]:621 "neurinoma,"[1] "neurolemmoma,"[1] and "Schwann cell tumor"[1]) is a benign nerve sheath tumor composed of Schwann cells, which normally produce the insulating myelin sheath covering peripheral nerves.

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, degenerating into a form of cancer known as neurofibrosarcoma.

Schwannomas can arise from a genetic disorder called neurofibromatosis. They are universally S-100 positive.

Schwannomas can be removed surgically, but can then recur.

See also[]


Additional images[]

References[]

  1. ↑ 1.0 1.1 1.2 1.3 Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set, St. Louis: Mosby.
  2. ↑ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.

See also[]


v·d·e
Nervous tissue tumors/NS neoplasm/Neuroectodermal tumor (ICD-O 9350–9589) (C70–C72, D32–D33, 191–192/225)
Endocrine/
sellar (9350–9379)
sellar: Craniopharyngioma · Pituicytoma
other: Pinealoma

CNS
(9380–9539)


Glioma

Astrocytoma (Pilocytic astrocytoma, Pleomorphic xanthoastrocytoma, Fibrillary (also diffuse or lowgrade) astrocytomas, Anaplastic astrocytoma, Glioblastoma multiforme)

Oligodendroglioma

Ependymoma · Subependymoma

Choroid plexus tumor (Choroid plexus papilloma, Choroid plexus carcinoma)

Multiple/unknown

Oligoastrocytoma · Gliomatosis cerebri · Gliosarcoma


Mature
neuron

Ganglioneuroma: Ganglioglioma · Retinoblastoma · Neurocytoma · Dysembryoplastic neuroepithelial tumour · Lhermitte-Duclos disease

PNET

Neuroblastoma (Esthesioneuroblastoma, Ganglioneuroblastoma) · Medulloblastoma · Atypical teratoid rhabdoid tumor

Primitive

Medulloepithelioma


Meningiomas
(meninges)

Meningioma, Hemangiopericytoma

Primary central nervous system lymphoma


PNS: NST
(9540–9579)

cranial and paraspinal nerves: Neurofibroma (Neurofibrosarcoma, Neurofibromatosis) · Neurilemmoma/Schwannoma (Acoustic neuroma) · Malignant peripheral nerve sheath tumor

note: not all brain tumors are of nervous tissue, and not all nervous tissue tumors are in the brain (see brain metastases)
[. v]·[. d]·[. e]

M: CNS

anat (n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco (m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug (N1A/2AB/C/3/4/7A/B/C/D)

[. v]·[. d]·[. e]

M: PNS

anat(h/r/t/c/b/l/s/a)/phys(r)/devp/prot/nttr/nttm/ntrp

proc, drug(N1B)


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