Schwannoma

Schwannoma
Schwannoma
Classification and external resources

Schwannoma
ICD-10 C72.4
ICD-9 225.1
ICD-O: M9560/0
DiseasesDB 33713
MeSH D009442

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.

Contents

See also

  • Intranodal palisaded myofibroblastoma

Additional images

  • Peripheral schwannoma Antoni type A (2).JPG

  • Subcutaneous schwannoma

  • Subcutaneous schwannoma (2) Antoni B.jpg
  • Subcutaneous schwannoma (3) Antoni B.jpg
  • Subcutaneous schwannoma (4) S-100 immunostain.jpg

References

  1. ^ a b c d Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0. 
  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 · eNervous tissue tumors/NS neoplasm/Neuroectodermal tumor (ICD-O 9350–9589) (C70–C72, D32–D33, 191–192/225)
Endocrine/
sellar (9350–9379)
CNS
(9380–9539)
Neuroepithelial
(brain tumors,
spinal tumors)
Astrocytoma (Pilocytic astrocytoma, Pleomorphic xanthoastrocytoma, Fibrillary (also diffuse or lowgrade) astrocytomas, Anaplastic astrocytoma, Glioblastoma multiforme)
Ependymoma · Subependymoma
Multiple/unknown
Mature
neuron
Primitive
Meningiomas
(meninges)
Hematopoietic
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)

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)

M: PNS

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

noco/auto/cong/tumr, sysi/epon, injr

proc, drug(N1B)

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Look at other dictionaries:

  • Schwannoma — periférico Antoni tipo A. El schwannoma, también conocido como neurilemmoma,[1] es un tumor de la vaina de mielina benigno compuesto por células de Schwann, las cuales normalmente producen la membrana aislante llamada vaina d …   Wikipedia Español

  • schwannoma — tumor de la sustancia blanca de Schwann Diccionario ilustrado de Términos Médicos.. Alvaro Galiano. 2010. schwannoma Tumor benigno, solitario, encapsulado, originado en el …   Diccionario médico

  • schwannoma — Eng. Schwannoma Ver neurilenoma …   Diccionario de oftalmología

  • schwannoma — n.; see neurofibroma, vestibular schwannoma …   The new mediacal dictionary

  • schwannoma coroideo — Eng. Schwannoma of the choroid Ver neurilenoma coroideo …   Diccionario de oftalmología

  • schwannoma — noun A benign nerve sheath tumour composed of Schwann cells …   Wiktionary

  • schwannoma — 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 …   Medical dictionary

  • schwannoma — n. abnormal tissue growth originating in the Schwann cells of the myelin sheath (Medicine) …   English contemporary dictionary

  • schwannoma — schwan·no·ma …   English syllables

  • schwannoma — 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 …   English dictionary of cancer terms

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