A CASE OF OXYPHILIC ADENOMA OF THE PAROTID GLAND

Abstract

We experienced a case of oxyphilic adenoma of the parotid gland. A 52-year-old man was admitted to our hospital because of a right parotid tumor. The tumor was elastic hard with a clear margin and 1.7×1.8cm in diameter. Ultraosonography visualized the tumor as a cyst with free internal echo level, however, CT scan demonstrated a solid mass with low-density area. FNA revealed foamy cells without nuclear pleomorphism, and the tumor was thought to be benign pleomorphic adenoma. After exploration of the tumor in the superificial lobe, the histological examination showed that the tumor consisted of large cells with eosinophilic granular cytoplasm and without infiltration into the normal gland, and that the tumor was oxyphilic adenoma. Oxyphilic adenomas of the parotid gland are very rare and represent 0.1-0.2% of all parotid tumors. Only 27 cases including this case have been reported in Japan.