A 70-year-old woman presented with chief complaints of swelling in the right side of her neck for 20 years, mainly in the submandibular region, with an increase in size 2 months prior, discharge of foul-smelling pus, ulceration of the overlying skin, and pain in the swelling for 15 days. Immunohistochemical studies reported the tumor to be a mixed malignant tumor arising from the submandibular gland. Wide excision of the tumor with deltopectoral flap was done.