Carcinomas of the submandibular and sublingual glands.

Neoplasms of the submandibular and sublingual salivary glands are much less numerous than those of the parotid gland, but they are more often malignant: nearly 50% for the submandibular and 80% for the sublingual glands. A submandibular gland origin also imparts to a given carcinoma a higher degree of biologic malignancy than is expressed by similar tumors in the parotid gland.