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Summary

This summary is machine-generated.

This study reports a case of vulvar and perianal warts in a mare, successfully treated with topical podophyllin. Histopathology revealed characteristic epidermal changes and a lack of melanin in the affected areas.

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Area of Science:

Veterinary Dermatology
Equine Pathology

Background:

Vulvar and perianal lesions in horses can present diagnostic challenges.
Wart-like growths require accurate identification for effective treatment.

Observation:

A 5-year-old Thoroughbred mare presented with chronic, whitish, moist lesions on the vulva and perianal region.
The lesions contrasted sharply in color with the surrounding normally pigmented skin.

Findings:

Topical treatment with 20% podophyllin in 95% ethyl alcohol resulted in rapid lesion involution.
Histopathology showed marked acanthosis, numerous mitoses, vacuolated epidermal cells, and dermal inflammation.
A notable absence of melanin in the basal cell layer of the lesions was observed, contrasting with normal epidermis.

Implications:

Podophyllin is an effective topical treatment for equine vulvar and perianal warts.
The amelanotic nature of the lesions is a key diagnostic feature.
Understanding these histopathological findings aids in differentiating these lesions from other dermatoses.