Abstract. 643 cases of salivary gland tumors constitute two series of histological sections that were studied from hospitals and dental schools in Southeast Scotland and Southern Ontario. The Scottish series represented epithelial tumors of the parotid and intra‐oral salivary glands, but the Canadian series also included tumors of the submandibular and sublingual glands. Classification was based on that recommended by the World Health Organisation (Thackray 1972). While direct statistical comparisons between the two series are not appropriate, the differences between them suggest that malignant tumors are more common in Canada. The Scottish series contains the largest proportion of benign salivary tumors so far imported. In the Scottish series, 88.7 % of parotid tumors were benign compared with 51.9% of the Canadian series. In the Canadian series from the submandibular glands, 21.2 % only were benign. Of the intra‐oral salivary tumors, 62.2 % from the Scottish series were benign compared with only 34.7 % from the Canadian series.
Seven patients with benign lymphoid hyperplasia of the palate are reported. Clinically, these lesions presented as painless non‐ulcerated masses that were unilateral in 6 of the cases and bilateral in one. Microscopically, the lesions were characterized by a mixed lymphoid infiltrate, germinal centres and vascular channels with hyperplasia of endothelial cells. The patients were followed for 3–10 years subsequent to diagnosis. One patient had 2 sequential lesions on opposite sides of the palate. Another patient with lesions of both submandibular salivary glands in addition to the palate developed rheumatoid arthritis, xerophthalmia and serologic changes consistent with systemic autoimmune disease. To date, none of the patients developed signs and symptoms of lymphoma or leukemia. The etiology of these lesions is unknown. Their distinction from lymphoma of the palate, as well as their possible relationship to the benign lymphoepithelial lesion of palatal mucous glands, is discussed.
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