Background: Canine granulomatous mural folliculitis is a very rare cause of scarring alopecia with unknown pathogenesis.
Hypothesis/objectives: To report a case of granulomatous mural folliculitis in a dog treated with ciclosporin (Cs) and methotrexate (MTX).
Animal: A 13-year-old spayed female Pyrenean shepherd dog with a one month history of scarring alopecia.
Methods And Results: Histopathological examination revealed a granulomatous and lymphocytic mural and necrotizing folliculitis and furunculosis. Immunochemistry, using antibodies for CD3, CD204, CD206, IBA-1 and CD208, revealed that CD3 lymphocytes were infiltrating the outer root sheath along with IBA-1 or CD204 cells. Ciclosporin (5 mg/kg once daily) and MTX (0.25 mg/kg once weekly then 0.5 mg/kg once weekly) were initiated simultaneously, and Cs was stopped after stabilization of the lesions. The dog's skin disease was stable for six months.
Conclusions And Clinical Importance: To the best of the authors' knowledge, this is the first report of the long-term management of a granulomatous mural folliculitis in a dog. Ciclosporin and MTX appeared to be an effective treatment option. Additional treated cases are needed to assess the effectiveness of MTX in canine immune-mediated diseases.
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