Pituitary Adenoma Leads to Adenoid Cystic Carcinoma in the Oral Cavity: An Intriguing Case.

Adenoid cystic carcinoma is a tumor of the exocrine glands originating primarily from the minor salivary glands. Though rare but there has been incidences of its spread into intracranial sites via different routes. We report of an intriguing case of remote metastasis of intracranial tumor in the pituitary diagnosed as pituitary adenoma which spread to the oral cavity as adenoid cystic carcinoma. To our knowledge, this is the first reported case of seeding of cells from intra cranial pituitary adenoma to intra-oral site manifesting as adenoid cystic carcinoma.