Single tooth causing pain!

A 72 y/o male with a chief complaint of pain in the right posterior mandible associated with the only intact tooth remaining in his mouth. The tooth had significant mobility. A single tooth with severe periodontitis involving the periapical area seen on radiograph. Clinically, there was right facial swelling and a hard mass palpable at the right angle of the mandible. CBCT is also attached. What is the differential diagnosis and treatment options?

Chronic perapical cyst. Rx- extraction, thorough irrigation and curettage socket preservation can be done preceding extraction if patients medical history is favourable .
Please post clinical pics along with your radiographs. It could e Radicular cyst, Malignancy?