A CILIATED CYST AS A COMPONENT OF PLEOMORPHIC ADENOMA OF THE PAROTID-GLAND

A large cyst, lined with ciliated cells (ciliated cyst), was found as a component of a pleomorphic adenoma of the left parotid gland in a 34 -year-old Japanese man. The dimensions of the tumor were 25x33 mm and it consisted of a solid mass with a centrally located cyst 20x23 mm, w hich contained yellowish-brown material of muddy consistency. The tumo r was encapsulated and the solid mass had features typical of a pleomo rphic adenoma. The inner surface of the cyst was lined with ciliated c ells and scattered mucus-secreting cells in addition to cuboidal-to-fl attened cells. In some regions: the neoplastic cells of the pleomorphi c adenoma were exposed to the cavity of the cyst. A histological trans formation from ciliated cells to pleomorphic adenomatous cells was als o observed. These findings indicated that the ciliated epithelium was an element of the rumor. This is the first report, to our knowledge, o f a ciliated cyst derived from some elements of a pleomorphic adenoma of the salivary gland.