Kuttner tumor of the submandibular gland: fine-needle aspiration cytologic findings of seven cases.

Kuttner tumor or chronic sclerosing sialadenitis is a benign inflammatory condition of the submandibular gland that mimics a malignant neoplasm clinically because of presentation as a hard mass. This is an underrecognized entity in the surgical pathology and cytology literature. We describe thefine-needle aspiration cytologic findings of 7 cases with histologic correlation. The 6 men and 1 woman (age, 47-72 years) had unilateral (4 cases) or bilateral (3 cases) submandibular masses known to be present for 1 month to 6 years (mean, 15 months). The aspirates were paucicellular to moderately cellular. They were characterized by scattered tubular ductal structures often enveloped by collagen bundles or lymphoplasmacytic infiltrate, isolated fragments of fibrous stroma, a background rich in lymphoid cells, and paucity or absence of acini. Histologic examination of the excised submandibular glands revealed preserved lobular architecture, thickening of interlobular septa by sclerotic tissue, dense lymphoplasmacytic infiltrate, preservation of ducts with periductal fibrosis, and variable loss of acini. In combination with the clinical findings, the fine-needle aspiration cytologic findings can strongly suggest the diagnosis of Kuttner tumor and may obviate the need of surgical intervention.