Pt come for check up, no complaining, after radiograph u see well circumscribe radiolucent area in related to mandibular molar & the periphery was radiopaque which not well defined border the diagnosis

Pt come for check up, no complaining, after radiograph u see well circumscribe radiolucent area in related to mandibular molar & the periphery was radiopaque which not well defined border the diagnosis is:

simple bone cyst. ***