choristoma


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choristoma

 [kor″is-to´mah]
a mass of histologically normal tissue in an abnormal location.

cho·ris·to·ma

(kō'ris-tō'mă),
A mass formed by maldevelopment of tissue of a type not normally found at that site.
[G. chōristos, separated, + -ōma]

choristoma

/cho·ris·to·ma/ (ko″ris-to´mah) a mass of histologically normal tissue in an abnormal location.

choristoma

Non-specialised tissue (chorista) that develops in utero and corresponds to normal cells and tissues located in abnormal sites (e.g., ectopic breast, liver or other tissues), which are called choristomas when they have a mass effect.

choristoma

Non-specialized tissue that develops in utero, which corresponds to normal cells and tissues located in abnormal sites–eg, ectopic breast, liver, or other tissues. See Neuromuscular choristoma.

cho·ris·to·ma

(kōr'is-tō'mă)
A mass formed by maldevelopment of tissue of a type not normally found at that site.
[G. chōristos, separated, + -ōma]

choristoma

a mass of histologically normal tissue in an abnormal location.
References in periodicals archive ?
Salivary gland choristoma of the middle ear: Role of intraoperative facial nerve monitoring.
Salivary gland choristoma in the middle ear: A case report.
Summary of the most common features of choristoma of the middle ear reported in the literature Feature Specific finding Demographic Young age characteristics Female preponderance Symptoms Conductive or mixed hearing loss Otoscopio A mass behind the posterior findings portion of an intact tympanic membrane Intraoperative Abnormal course facial nerve Adherence to the mass findings Dehiscence
We can therefore speculate that so-called middle ear choristomas may, at least in some cases, originate in the endodermal layer of the first branchial pouch of the primitive pharynx.
If a suspected choristomas main component is an exuberant organoid respiratory epithelium and if the salivary glands represent the result of a successive metaplastic change, then the term hamartoma appears to be a more appropriate description of the lesion.
Glial choristoma of the temporal bone in a 7-month-old infant.
A case of neuroglia choristoma in middle ear [in Chinese].
Glial choristomas are classified into six types according to their location and possible pathologic mechanisms:
6) The presence of heterotopic brain tissue at sites away from the midline is uncommon, and therefore glial choristomas of the middle ear are rare.
Salivary gland choristomas of the middle ear are often associated with abnormalities in the facial nerve and branchial clefts, which suggests the role of developmental errors.
Histologically, glial choristomas are composed of mature CNS components, including glial cells and neural cells.
6) For glial choristomas, complete excision provides definitive treatment, while encephalocdes might require additional surgical measures in order to repair dural defects.