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'D-shaped' and 'reverse-D-shaped' pupil in a cat with lymphosarcoma
1Clinic of Surgery and Ophthalmology, Veterinary University of Vienna, Austria; Institute of Pathology and Forensic Veterinary Medicine, Veterinary University of Vienna, Austria.
Veterinary Ophthalmology
|June 9, 2001
Summary
Ocular lymphosarcoma in a cat caused abnormal pupil shapes due to iris infiltration, not neurological issues. This condition led to vision loss and inflammation in both eyes.
Area of Science:
- Veterinary Medicine
- Ophthalmology
- Oncology
Background:
- Feline lymphosarcoma can affect various organs, including the eyes.
- Ocular manifestations of lymphosarcoma can lead to significant visual impairment.
- Aberrant pupil shapes are uncommon and require thorough investigation.
Purpose of the Study:
- To investigate the cause of visual reduction and abnormal pupil shapes in a feline patient.
- To determine the underlying pathology of fibrinous anterior uveitis and chorioretinitis.
- To elucidate the mechanism behind persistent aberrant pupil shapes.
Main Methods:
- Clinical examination of a 7-year-old European shorthair cat with visual deficits.
- Ophthalmic assessment including pupil shape evaluation, anterior uveitis, and chorioretinitis diagnosis.
- Histopathological examination of ocular and intestinal tissues.
Main Results:
- The cat presented with 'D-shaped' and 'reverse-D-shaped' pupils, indicating significant iris abnormalities.
- Fibrinous anterior uveitis, exudates, corneal precipitates, chorioretinitis, retinal detachment, and peripapillary edema were observed.
- Histopathology confirmed intestinal and ocular lymphosarcoma, with iris stromal infiltration causing the aberrant pupil shapes.
Conclusions:
- Ocular lymphosarcoma is a critical differential diagnosis for feline uveitis and vision loss.
- Iris infiltration by lymphosarcoma can cause persistent, non-neurological pupil deformities.
- The specific medial iris involvement pattern warrants further investigation.