Description: This is a cyst at the apex of a non-vital tooth and is a sequela of pulpitis. Periapical cysts bear a great resemblance to dental granulomas. About the only substantive difference is the presence of an epithelium lined central cavity in the cyst. The associated tooth is usually asymptomatic. Acute infectious episodes may cause pain. The lesion appears as a sharply circumscribed radiolucent lesion around the apex of the associated tooth. It is often stated to have a thin sclerotic rim at the border but this feature is absent as often as present.
Etiology: This cyst is a direct sequela of inflammation of the pulp which has extended into the adjacent periapical tissues. Treatment: Treatment consists of endodontic therapy or extraction of the associated tooth with curettage of the cyst.
Prognosis: Good
Differential diagnosis: Dental granuloma.