Abstract
A 19-year-old, spayed female, domestic short-haired cat was presented with approximately 1.0 cm erosion of the skin of the chin. Cytologically, the smears were cellular with cohesive groups occasionally forming gland like structures and short chains of a few cells in straight or curved lines. Histologically, the epidermis was focally thickened with a neoplasm which was composed of neoplastic epithelial cells arranged in nests, pseudocysts, pseudoglands with marked acantholysis, and occasional keratin pearls. Anisocytosis and anisokaryosis were severe and mitotic figures were frequently observed. The pathological features described above were consistent with acantholytic squamous cell carcinoma. Squamous cell carcinoma should be included in differential diagnoses for dermatitis-like lesions in the skin of the chin of even old-aged cats.
