A 56-year-old man complains of swelling and pain in his right parotid area. The swelling was noticed 5-6 months ago. Objectively right-sided paresis of the facial muscles can be determined. Palpation reveals there a modrately painful tuberous tumor fused with surrounding tissues. In the center of the tumor there is an area of softening. Submandibular and cervical lymph nodes on the right are enlarged and dense. The mouth can be opened without restriction. There is no saliva outflow from the opening of the right parotid gland. What provisional diagnosis can be made?