A 56-year-old man complains of a painful swelling in his right parotid area. The swelling was noticed 5-6 months ago. Objectively, he has a right-sided paresis of the facial muscles. Palpation reveals a moderately painful tuberous tumor fused with the surrounding tissues. In the center of the tumor, there is an area of softening. The submandibular and cervical lymph nodes on the right are enlarged and dense. The mouth can be opened without restriction. No saliva flows out from the duct of the right parotid gland. What provisional diagnosis can be made?