Ulcerative pododermatitis in a cat associated with Anatrichosoma sp.

A 9-year-old castrated male Chartreaux cat was presented for an ulcerative pododermatitis of all 4 paws. A clinical exam was inconclusive and supportive therapy did not improve the condition. Histologic examination revealed an ulcerative and eosinophilic dermatitis associated with epidermal and dermal nematodes and ova consistent with the aphasmid Anatrichosoma sp. Treatment with ivermectin completely resolved the skin lesions. Anatrichosomiasis should be included in the differential diagnosis of ulcerative pododermatitis in cats, at least in the southwestern United States.