cholesteatoma

cholesteatoma
1. A mass of keratinized squamous cell epithelium and cholesterol in the middle ear, usually resulting from chronic otitis media, with squamous metaplasia or extension of squamous epithelium inward to line an expanding cystic cavity that may involve the mastoid and erode surrounding bone. 2. An epidermoid cyst arising in the central nervous system in humans or animals. [cholesterol + G. stear (steat-), tallow, + -oma, tumor]

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cho·les·te·a·to·ma kə-.les-tē-ə-'tō-mə, .kō-lə-.stē-, .käl-ə- n, pl -mas also -ma·ta -mət-ə
1) an epidermoid cyst usu. in the brain arising from aberrant embryonic rests and appearing as a compact shiny flaky mass called also pearly tumor
2) a tumor usu. growing in a confined space (as the middle ear or mastoid) and frequently constituting a sequel to chronic otitis media
cho·les·te·a·to·ma·tous -mət-əs adj

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n.
a skin-lined sac containing debris from dead skin cells that grows from the eardrum into the mastoid bone, eroding normal structures in its path. Left untreated, it can carry infection to the brain, causing meningitis or a cerebral abscess. Treatment is by means of mastoidectomy. Rarely, cholesteatoma can arise congenitally in the temporal bone or central nervous system.

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cho·le·ste·a·to·ma (ko″lə-ste″ə-toґmə) [chole- + steatoma] a cystlike mass or benign tumor lined with stratified squamous epithelium, usually keratinizing, and filled with desquamating debris often including cholesterol. Cholesteatomas are most common in the middle ear and mastoid region secondary to trauma or infection that heals improperly so that epithelium invaginates. A congenital variety (see congenital c.), resulting from embryonic inclusions, is less common.

Cholesteatoma.


Medical dictionary. 2011.

См. также в других словарях:

  • Cholesteatoma — Classification and external resources Cholesteatoma ICD 10 H71 …   Wikipedia

  • cholesteatoma — n. a skin lined sac containing debris from dead skin cells that grows from the eardrum into the mastoid bone, eroding normal structures in its path. Left untreated, it can carry infection to the brain, causing meningitis or a cerebral abscess.… …   The new mediacal dictionary

  • cholesteatoma — noun A destructive and expanding keratinizing squamous epithelium in the middle ear and/or mastoid process …   Wiktionary

  • cholesteatoma — cho·les·te·a·to·ma …   English syllables

  • cholesteatoma — …   Useful english dictionary

  • cholesteatoma tympani — a type of cholesteatoma usually associated with chronic infection of the middle ear, formed of the outer desquamating layers of stratified squamous epithelium that have extended inward and upward to line the tympanum, epitympanum, and antrum …   Medical dictionary

  • congenital cholesteatoma — a benign tumor resulting from inclusion of epidermal elements at the time of closure of the neural groove; it may be in or near the ear but more often is in the form of an intracranial cholesteatoma …   Medical dictionary

  • intracranial cholesteatoma — a type of congenital cholesteatoma resembling an epidermal inclusion cyst, found in the skull, meninges, or brain; it grows slowly, often in the cisterns. Symptoms vary depending on what part of the brain is under pressure, but may become life… …   Medical dictionary

  • Холестеатома (Cholesteatoma) — ограниченная слоем кожи полость, содержащая слои омертвевших клеток кожи, которые прорастают из среднего уха в сосцевидный отросток височной кости, разрушая нормальные ткани по ходу своего роста. Нелеченная холестеатома может привести к… …   Медицинские термины

  • холестеатома — (cholesteatoma; холе(стерин) + греч. stear, steatos жир + ома; син. опухоль жемчужна ) опухолевидное образование, представляющее собой скопление кератина, кристаллов холестерина и спущенного ороговевшего эпителия, окруженное соединительнотканной… …   Большой медицинский словарь


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