[Association of an adenoid cystic epithelioma with a clear cell carcinoma of the palate].

An infrequent polymorphous minor salivary gland tumor is described. It involved the palate and later invaded the upper jaw. The morphologic features are those of both adenoid cystic carcinoma and clear cell carcinoma. The clinical course, the cellular admixture of tumour components, and the immunohistologic results allow us to propose that clear cell carcinoma originating from adenoid cystic carcinoma offers the worst prognosis.