Abstract
Three foci of black crust-like lesions without thickening appeared in the dorsal skin of a15-year-old spayed female cat. Based on the initial diagnosis obtained from a skin biopsy, antiallergic treatment was attempted, but the skin lesions did not improve. The lesions changed into pigmentary thick plaques with an increase in their number. Total excision of the skin lesions was then performed, eighteen months after the initial diagnosis. Histopathologically, the skin lesions were diagnosed as squamous cell carcinoma in situ (Bowen-likedisease). Since cellular atypism and proliferative activity were not evident in the first biopsy specimens, neoplastic lesions may progress slowly over time. A new small focus appeared three months after the operation.
