ectropion (redirected from intermittent acquired ectropion, physiological ectropion)

ectropion /ec·tro·pi·on/ (ek-tro´pe-on) eversion or turning outward, as of the margin of an eyelid.

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ec·tro·pi·on (k-trp-n, -n)

n.

A rolling outward of the margin of a body part, especially an eyelid.

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Ectropion

A complication of blepharoplasty, in which the lower lid is pulled downward, exposing the surface below.

Mentioned in: Blepharoplasty

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ectropion

[ektrō′pē·on]

Etymology: Gk, ek + trepein, to turn

eversion, most commonly of the eyelid, exposing the conjunctival membrane lining the eyelid and part of the eyeball. The condition may involve only the lower eyelid or both eyelids. The cause may be paralysis of the facial nerve, scarring, neoplasia, or, in an older person, atrophy of the eyelid tissues. Compare entropion.

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ectropion (ektrō´pēon),

n an eversion, or rolling outward, of the eyelid margin.

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ectropion

eversion or turning outward, as of the margin of an eyelid.

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cicatricial ectropion

caused by contraction of scar tissue following injury or surgery to the eyelid.

congenital ectropion

most commonly seen in some breeds of dogs, such as St. Bernard, Bloodhound and spaniels where it may be considered normal. Called also heritable ectropion.

heritable ectropion

see congenital ectropion (above).

intermittent acquired ectropion, physiological ectropion

may occur in some dogs intermittently for unknown reasons.

physiological ectropion

see intermittent acquired ectropion (above).

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ectropion

Outward turning of the eyelid margin. The most common cause is a loss of tonus of the pretarsal orbicularis muscle combined with laxity of the medial and lateral canthal tendons, which occurs in old people and affects only the lower eyelid (involutional ectropion). Tears collect in the lacrimal lake and overflow onto the skin of the face. Other causes of ectropion are scarring, burns, trauma (called cicatricial ectropion), spasm of the orbicularis muscle, which may affect either the upper or lower eyelid, or paralysis of the orbicularis muscle in which only the lower eyelid is affected. Ectropion may lead to exposure keratitis as the lower part of the cornea remains exposed. Management includes instilling an ocular lubricant and patching the eye during sleep as a temporary measure, but, if severe, the treatment is surgical.
cicatricial ectropion; involutional ectropion See ectropion.
congenital ectropion A rare congenital eversion of the eyelid (most often the lower). It may be due to a deficiency of the anterior eyelid lamina. It is usually associated with other disorders, such as blepharophimosis syndrome or Down's syndrome.
ectropion uveae A turning of a portion of the posterior pigment epithelium of the iris growing or being drawn around the pupillary margin onto the anterior iris surface. It may be acquired (e.g. following iris neovascularization, neovascular glaucoma, iris melanoma) or congenital (e.g. neurofibromatosis).

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ectropion

Ophthalmology The outward rolling of an anatomic margin, usually understood to be that of the eyelid