Page 1192 - Problem-Based Feline Medicine

1184 PART 15 CAT WITH EYE PROBLEMS

retinal detachment. Check these cats for renal disease Diagnosis
and hyper-thyroidism.
Old cats that have a prior history of trauma, and present
Inflammatory chorioretinitis is always appears as with glaucoma and signs of uveitis and keratitis, are
cloudy eyes that have uveitis. Laboratory tests are use- candidates for this rare condition.
ful to confirm diagnoses.
Fine-needle biopsy may be done, but may not yield
Treatment a diagnostic sample if the tumor contains fibrous and
cartilagenous tissue.
There is no treatment for this form of retinal degener-
Histopathology of enucleated globes provides a defin-
ation. Breeders need to be made aware of the mode of
itive diagnosis, and will show changes that may include
inheritance.
granulation tissue, fibrosarcoma, osteosarcoma and
TRAUMA-ASSOCIATED OCULAR SARCOMA anaplastic spindle cell sarcoma.

Classical signs Treatment
● Rare, primary neoplasia that occurs in All blind globes with chronic uveitis should be
older cats (7–15 years). watched for the development of this condition.
● History of previous severe trauma to eye.
Early enucleation with histopathology should be
● Anterior uveitis, keratitis (corneal edema
done on all globes where there is a prior history of
and pigmentation) and glaucoma.
trauma, and there are changes in the size and shape
● White to pinkish masses may be visible in
of the globe, or changes in the anterior chamber and
the vitreous.
cornea, that are indicative of intra-ocular disease.
Clinical signs Severely traumatized blind eyes in cats should be
enucleated, to prevent the occurrence of this condition,
Trauma-associated ocular sarcoma is a rare primary particularly if there has been lens rupture.
neoplasia reported only in cats.
In confirmed cases, check for metastases to regional
It occurs in older cats, typically 7–15 years of age lymph nodes, and other organs such as lungs and liver.
that have had a history of ocular trauma 3–10 years
previously.
METASTATIC INTRA-RETINAL NEOPLASIA
Signs of anterior uveitis and keratitis may be evident,
as edema and pigmentation of the cornea, and a cloudy
Classical signs
eye. These changes may prevent visualization of the
intra-ocular structures. ● Rare in cats.
● Uveitis with corneal edema, cloudy
Secondary glaucoma is common at this stage of the
aqueous and distorted pupil.
disease. The eye will show buphthalmos (enlarged globe)
● Swelling and pigment changes in the
with engorged scleral vessels.
retina.
If the posterior segment can be visualized, white to
pink masses may be seen.
The condition is thought to occur after lens trauma, Clinical signs
which triggers the lens epithelial cells to undergo
This is a rare condition in cats.
metaplasia.
Most cases present as anterior uveitis with corneal
The neoplasia rapidly extends through the choroid, and
edema and a cloudy aqueous, and have some form of
infiltrates the optic nerve. Metastasis has been reported.
swelling seen in the iris, which may cause distortion of
Survival rate is very low. the pupil (dyscoria).