Sclerosing Polycystic Adenoma Masquerading as Malignancy on Fine Needle Aspiration Cytology.
Sclerosing polycystic adenoma (SPA) is a rare benign salivary gland neoplasm composed of a lobular proliferation of ducts lined by cuboidal, columnar, apocrine, and foamy vacuolated cells, and acinar structures having large cells with intracytoplasmic bright eosinophilic granules in a collagenous stroma with lymphoid a...