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There is a large expansile bony lesion of the left hemi-mandible noted, measuring. Cortical thinning is noted with no definite dehiscence. There is no knife edge resorption of the involved teeth roots. The lesion contains complex fluid with a HU of 23. There is no soft tissue component noted. The lesion involves the inferior alveolar canal. There is no suspicious local adenopathy. There is bilateral maxillary sinus disease.

CONCLUSION:

Expansile bony lesion involving the left hemi-mandible. The imaging features are not typical of an ameloblastoma. While there is involvement of the roots of the teeth, there is not knife edge resorption as described in ameloblastoma. The differential includes a aneurysmal bone cyst or giant cell reparative granuloma.

MRI correlation and biopsy is indicated.