Chorioretinitis results in which change?

Chorioretinitis results in which change?

• A. Depigmentation of non-tapetum around disc
• B. Hyperpigmentation of tapetum
• C. Thickening of the sclera
• D. Vascular shunting

Answer: (A)

Chorioretinitis causes inflammatory damage to the choroid and retina, leading to scarring and loss of pigment. In horses, this most often shows up as pale, depigmented areas in the non-tapetal retina around the optic disc. The tapetum lucidem is a separate layer, and chorioretinal inflammation typically does not present as hyperpigmentation of the tapetum. Thickening of the sclera or vascular shunting are not characteristic fundoscopic signs of chorioretinitis. So the depigmentation in the non-tapetal retina around the disc is the classic, most consistent change you’d expect.

Chorioretinitis causes inflammatory damage to the choroid and retina, leading to scarring and loss of pigment. In horses, this most often shows up as pale, depigmented areas in the non-tapetal retina around the optic disc. The tapetum lucidem is a separate layer, and chorioretinal inflammation typically does not present as hyperpigmentation of the tapetum. Thickening of the sclera or vascular shunting are not characteristic fundoscopic signs of chorioretinitis. So the depigmentation in the non-tapetal retina around the disc is the classic, most consistent change you’d expect.