Sebaceous lesions of salivary glands and oral cavity.

Sebaceous differentiation in the oral mucosa and major salivary duct epithelium is an expected normal finding in humans. These usually asymptomatic and incidental collections of sebaceous cells can also be found in intimate or close relationship with definable classes of salivary gland neoplasms, or as sebaceous neoplasms of salivary glands. The neoplasms are uncommon and are classified as sebaceous lymphadenoma, sebaceous adenoma, and sebaceous carcinoma. The two adenomas have a low recurrence potential; the carcinomas have a biologic behavior like that of ocular sebaceous carcinomas.