Abstract
A 45-year-old woman noticed a painless mass in the left parotid region 3 months before she visited our hospital. A 2-cm mass was found in the superficial lobe of the left parotid gland. Magnetic resonance imaging and fine needle aspiration cytology suggested benign parotid tumors such as pleomorphic adenoma or Warthin tumor. The patient underwent superficial parotidectomy. Histologically, the peripheral part of the mass contained an abundant fat component. In the central part, tubular and cribriform epithelial hyperplasia with apocrine-like metaplasia were focally seen in the fibrotic background, and eosinophilic granules could be observed in acinar cells. Therefore, we diagnosed this case as sclerosing polycystic adenosis （SPA）. The patient has been followed without recurrence for one year. SPA is a rare, benign salivary disease commonly arising in the parotid gland. Careful follow-up is required because some cases of recurrence or malignant transformation have been reported.
