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Conjunctival concretion
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Conjunctival concretion : ウィキペディア英語版
Conjunctival concretion

Concretion in the palpebral conjunctiva, is called conjunctival concretion, that is a (or a cluster) small, hard, yellowish-white calcified matter, superficially buried beneath the palpebral conjunctiva. Most of concretions in the eye form in the palpebral conjunctiva, which is a clear membrane to surround the inside of the eyelid. Less can be located in the cornea and retina.
==Cause==
Chronic conjunctivitis (e.g. trachoma) and aging factor are two causes of conjunctival concretion, which will make the conjunctiva cellular degeneration to produce an epithelial inclusion cyst, filled with epithelial cells and keratin debris. After calcification, the conjunctival cyst hardens and forms a conjunctival concretion. Congenital conjunctival concretion condition is also more common.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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