A single cyst with a circumscribed circular structure that contained body hairs was observed in the tongue of a slaughtered Japanese Black cow. The diameter of the cyst was approximately 22 mm, and it was located within the muscle layer in the midline of the tongue and connected to the dorsal surface of the tongue by a small pore. Histopathological examination revealed that the cyst wall was composed of stratified squamous epithelium with many hair follicles. Some parts of the cyst wall were thin and ruptured, and there was chronic inflammation in the neighboring structures. Based on these findings, it was diagnosed as a dermoid cyst. This is the first report of a lingual dermoid cyst in cattle.
