Tyrosine-rich crystalloids in a fine needle aspirate of a polymorphous low grade adenocarcinoma of a minor salivary gland. A case report.

Tyrosine-rich crystalloids were identified in a fine needle aspirate of a polymorphous low grade adenocarcinoma of a minor salivary gland. Such crystalloids have been described previously as occurring in tissue sections of both benign and malignant salivary gland neoplasms and in the fine needle aspirate of a pleomorphic adenoma. Their presence either in fine needle aspirates or tissue sections of salivary gland tumors should be interpreted only as an incidental and nonspecific finding and should not be used to support either a benign or malignant diagnosis.