Mucocutaneous horn in dog
Araújo, Joyce Maira deLima, Stephanie Carrelo deRondon, Eric Schmidt
Background: Cutaneous horn is a circumscribed exophytic lesion composed of dense, compact keratin with hyperplasticepidermis, which is primarily orthokeratotic and may include foci of parakeratosis. The hyperkeratotic protuberance resembles a horn but lack bone. In humans, it is well-documented with a wide range of primary epidermal lesions identified.In dogs, the reports are rare and brief. The diagnosis is based on its appearance and excisional biopsy reveals the triggeringlesion. The objective of the present work is to describe the clinical presentation, predictive benignancy finds, treatmentand follow-up of a case of cutaneous horns that arose from anal mucocutaneous boundary in a dog.Case: A 6-month-old male Pug presented two tumors in the anus noted in the early months of life. Complete blood count,serum chemistry profile, surgery, histopathological analysis and postoperative outcome were performed. Possible relapseswere follow-up until 11 months after surgery. On physical examination, the dog was otherwise healthy. The two horn-liketumors were protruding from the mucocutaneous junction of the external anal sphincter in a sun-protected area. Both werehigher than wide in base or, in other words, they had a high height-to-base ratio. During surgery, the masses were excisedusing an electronic scalpel and sent to histopathological analysis. The post-operative care consisted of cephalexin andmeloxicam prescriptions. Also, it was recommended 0.9% NaCl solution wound flushing followed by topical chlorhexidinedigluconate solution (1%) whenever dirt or defecation were noticed. The surgical wound healed after two weeks by secondintention. Histopathology found well-delimited masses that covers the epidermis and dermis and displaces the cutaneousappendages towards the underlying musculature with an aggregate of lymphoplasmohistiocytic inflammatory infiltrate inthe adjacent...(AU)
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