Adenoid cystic carcinoma of the dorsum of the tongue: presentation of a case.

Adenoid cystic carcinoma is the most frequent malignant neoplasm of minor salivary glands (76.5%); it is clinically characterized by slow growth, and its most frequent localization is the hard palate. Histopathologically it presents three patterns, cribriform, tubular and solid; the solid type is related to a poor prognostic contrary to the cribriform type, which has a better prognosis. Surgical excision with wide margins is the treatment of choice, if it metastasizes to lymph nodules, post surgical radiotherapy is recommended. A 19 year-old man presented a recurrent lesion on the dorsum of the tongue previously diagnosed as monomorphic adenoma. In a second biopsy it was diagnosed as adenoid cystic carcinoma. The following immunohistochemical studies were ordered: CALP, CEA, Epithelial Membrane Antigen, Glial Fibrilar Acid Protein, Ki67; all of these studies were positive and with different intensities, corroborating the diagnosis of adenoid cystic carcinoma. The patient had a recurrence after 2 years.