How rare are submandibular tumors, both benign and malignant? statistics? would be rare in healthy person in thirties? likelihood, only.

They are rare: Tumors of the submandibular gland are rare, comprising less than 2% of head and neck neoplasia. Both benign and malignant lesions show a mild symptomatology, resulting in late presentation and in advanced stage of disease. Benign submandibular gland tumors manifest a mild course of disease, and local excision along with the gland is a safe and effective method of treatment. Malignant tumors - late