Radicular Cyst
Pronunciation: rad-IK-yoo-lar SIST
The most common odontogenic cyst, arising from the epithelial cell rests of Malassez at the apex of a non-vital tooth, appearing radiographically as a well-defined periapical radiolucency.
Full Definition
Radicular cysts, also known as periapical cysts or apical periodontal cysts, develop as a consequence of pulp necrosis and chronic apical inflammation. They are the most frequently encountered jaw cysts and typically appear on radiographs as round or ovoid well-defined radiolucencies with a corticated margin at the root apex. Size alone cannot reliably distinguish a radicular cyst from a periapical granuloma; histopathological examination is required for definitive diagnosis. Editors should note that 'residual cyst' is the correct term when the cyst persists after extraction of the causative tooth and must not be used interchangeably with 'radicular cyst.'
Usage
Usage note: Ensure 'radicular' is not mistyped as 'radicalar' or confused with 'residual cyst.' The latter term applies only post-extraction.
In Context
- "A well-corticated periapical radiolucency of 12 mm diameter associated with the non-vital upper right lateral incisor is consistent with a radicular cyst." — Oral and maxillofacial radiology report
- "Radiographic differentiation between a radicular cyst and a periapical granuloma is not possible; tissue diagnosis is required." — Endodontic guidelines