Abstract

Salivary gland papillary cystadenocarcinomas are rare lesions, and particularly when they are found in the oral cavity. They have been recognized as being low grade carcinomas of the salivary glands. The author reports here on a case of recurrent papillary cystadenocarcinoma in the right retromolar area. The initial mass had multicystic and papillary structures with low grade features. The recurred mass showed basically the same histologic features. However the layer of papillae and the solid portion were increased and the tumor cells were larger and more pleomorphic with prominent nucleoli and frequent mitoses. Focal comedo type tumor necrosis and spindle cell proliferations in the surrounding soft tissue were present. This is a very rare report of a minor salivary gland papillary cystadenocarcinoma in a Korean, and the morphologic dedifferentiation was accompanied by the clinical recurrence.

• Keywords: Papillary cystadenocarcinomas;Salivary gland;Retromolar;