Esophageal adenosquamous carcinoma in a cat

Esophageal carcinoma was observed in an eight-year-old, castrated male, Jap anese domestic cat. Histologically, this neoplasm consisted of two differen t growth patterns, squamous cell carcinoma and adenocarcinoma. The results of immunohistochemical examination supported the fact that the two kinds of neoplastic cells have different characteristics. The tumor was, therefore, diagnosed as adenosquamous carcinoma. Esophageal tumors in the cat are ver y rare and, if any, neither adenocarcinoma nor adenosquamous carcinoma has been reported up to the present.