Benign lymphoepithelial parotid cyst with sebaceous differentiation--cystic sebaceous lymphadenoma.

A case of benign lymphoepithelial parotid cyst with sebaceous differentiation, or cystic sebaceous lymphadenoma, in a 57-year-old white man is presented. The literature on lymphoepithelial cysts and sebaceous lymphadenomas of the parotid gland is reviewed, and the alternative hypotheses of "branchial cleft origin" and "intranodal salivary gland inclusion origin" are compared. This case lends support to the intranodal glandular inclusion theory for lymphoepithelial cysts of the parotid.