1. Progressive retrocorneal pigmentation in dogs: A clinical report of 34 cases
- Author
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Sanchez, Rick F, Everson, Richard, Escanilla, Natalia, Cebrian, Prado, Slenter, Inge J M, Grinwis, Guy C M, Göerig, Christiane, Chirurgie, VPDC pathologie, dPB CR, Veterinair Pathologisch Diagnostisch Cnt, LS Pathologie, Chirurgie, VPDC pathologie, dPB CR, Veterinair Pathologisch Diagnostisch Cnt, and LS Pathologie
- Subjects
Male ,medicine.medical_specialty ,Ophthalmic examination ,040301 veterinary sciences ,progressive pigmentation ,Gonioscopy ,endothelial pigmentation ,Corneal Diseases ,0403 veterinary science ,Lesion ,03 medical and health sciences ,Dogs ,0302 clinical medicine ,Clinical report ,Cataracts ,Ophthalmology ,Cornea ,medicine ,Animals ,Dog Diseases ,Retrospective Studies ,General Veterinary ,medicine.diagnostic_test ,business.industry ,corneal clarity ,Mean age ,04 agricultural and veterinary sciences ,corneal pigmentation ,medicine.disease ,pigmentdispersion ,eye diseases ,medicine.anatomical_structure ,Disease Progression ,030221 ophthalmology & optometry ,Primary glaucoma ,Female ,sense organs ,medicine.symptom ,business ,limbal pigment ,Pigmentation Disorders - Abstract
Objectives To describe the signalment, ophthalmic examination findings, and follow-up of dogs affected with a previously unreported retrocorneal pigmentary lesion. Materials and methods Retrospective record evaluation spanning 2009-2019. Results Retrocorneal pigmentary lesions were described in 34 patients (46 eyes). German Shepherds (n = 7), Jack Russel terriers (n = 5), and terrier crosses (n = 4) made up 16/34 (47.1%) of the cases. The mean age was 13.5 years (range 1.4-14.2 years), and 16/30 (53.3%) dogs were female. Most dogs were affected unilaterally (22/34 (64.7%)), the others bilaterally, and 5/34 (14.7%) were referred for it while the others were incidentally diagnosed. The lesions affected the ventral, peripheral, inner cornea and had a round/undulated leading edge. The number of corneal clock hours affected was known for 41/46 (89.1%) eyes and involved 1-3 clock hours in 32/41 (78.1%) eyes, 4-6 in 6/41 (14.6%), 7-9 in 2/41 (4.9%), and 10 in 1/41 (2.4%). The central cornea was affected in 9/46 (19.6%) eyes, and in 5/9 (55.6%), the median corneal clarity score was G2 (scale: G0-G4). The commonest additional findings included free-floating uveal cysts (11/34 dogs, 32.4%), cataracts (6/34 dogs, 17.6%), and primary glaucoma (5/34 dogs, 14.7%). Gonioscopy was available in 16/34 (47.1%) dogs and was normal except in primary glaucoma cases. Follow-up was documented in 13/34 (38.2%) dogs with a mean follow-up of 17 months (range: 5-26 months). Lesion progression was documented in 6/13 (46.2%) dogs. Conclusions Retrocorneal pigmentation occurs as a slowly progressive lesion of older dogs that could impact vision. Histological studies of affected eyes are warranted.
- Published
- 2020