Tumors of salivary glands are relatively rare but it is often taken for clinical malignancy due to its not uncommon metastasis and recurrence in spite of histopathological benignity. There is many debate on the histopathological classification and the developmental mechanism. We have the following results. with the studies of 149 patients from 1960 to 1975 for 16 years.
1) Sex ratio of male to female is 1.3 : 1 and each average age is 46.8yr and 43.3yr.
2) Benign tumor is 1.4 times more frequent than malignant tumor and average age is 42.5yr. (benign) and 49.2yr (malignant), so 6.7yr is higher in malignant tumor.
3) The tumor incidence is 1.3 times more frequent in major salivary, glands than minor; The parotid gland is the most frequent site with malignant tumor (13.0%) and benign tumor (52.9%) in major salivary glands. The palate is the most frequent site. with malignant tumor (31.6%) and benign tumor (30.3%) in minor salivary glands. Malignancy is relatively more predominant .in minor than in major salivary glands.
4) The most frequent histologic type is pleomorphic adenoma (56.4% of total tumor) and most of pleomorphic adenoma occurred in the parotid gland (41.0%) and the following frequency with the palate (21.0%), the submandibular. gland (15.7%) etc. All three monomorphic adenoma is involved in the parotid gland.
5) In malignant tumor the site is various and same ratio in major and minor salivary glands with the following histologic frequency; undifferentiated ca. (30.6%) epidermoid, ca. (16.1%), adenoca (14.5%), mucoepidermoid ca. (14.5%), adenoid cystic ca. (12.9%), ca. in, plemorphic adenoma (8.1%) and acinic cell ca. (4.8%).
6) It seems that myoepithelial and ductal epithelial cell has important roll in variety of tumor, any needle or limited biopsy is contraindicated to reduce metastasis and recurrence, initial adequate resection is the choice of treatment with frozen section during operation.
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