Fig. 1
From: Radiolucent lesions of the mandible: a pattern-based approach to diagnosis
Radicular cyst. a OPT. Unilocular radiolucent lesion with well-defined borders (asterisk) displacing teeth 33 and 34. b CT, sagittal oblique 2D MPR with bone windows. Cystic lesion surrounding the root (dashed arrow) of the non-vital tooth 34. Associated large caries with pulpal necrosis (arrow). c Histology (haematoxylin-eosin stain, original magnification 20×): fibrous connective wall containing a dense chronic inflammatory infiltrate and congested vessels (asterisk) lined by irregular non-keratinised stratified squamous epithelium. Spongiotic epithelium (arrows) penetrated by neutrophils