Medial Canthal Entropion
WHAT IS MEDIAL CANTHAL ENTROPION?
Entropion is an abnormal inward rotation of the eyelid margin such that the haired skin contacts the conjunctival and corneal surfaces of the eye. Medial canthus refers to the inner corner of the eye.
ARE CERTAIN BREEDS MORE COMMONLY AFFECTED?
Yes. Brachycephalic breeds are commonly affected. Medial canthal entropion occurs frequently in the Pekingese, Shih Tzu, Boston Terrier, Pug, Bulldog, Lhasa Apso, Cavalier King Charles Spaniel, Toy and Miniature Poodle, and Maltese. It is also common in brachycephalic cats such as Persian, Himalayan, and Burmese.
HOW DO I RECOGNIZE THAT MY PET HAS MEDIAL CANTHAL ENTROPION?
Most pet owners notice increased tearing. This is caused by the chronic irritation as well as mechanic obstruction of the conjunctival opening that leads into the nasolacrimal duct. Therefore normal drainage of the tears is impaired. Chronic corneal irritation can lead to pigmentary keratitis in dogs or corneal sequestrum formation in cats.
HOW IS MEDIAL CANTHAL ENTROPION TREATED?
Medial canthal entropion may require surgical correction in cases of severe irritation. For medial canthal entropion surgery, the amount of tissue that is removed has to be estimated. If medial canthal entropion stays uncorrected, subsequent corneal ulceration, pigmentation, and scarring may produce vision loss.