Fig. 5
From: Masses of developmental and genetic origin affecting the paediatric craniofacial skeleton
Characteristic radiological findings of odontogenic keratocyst (OKC) as seen in an elderly male. a OPT shows a large, well-defined osteolytic lesion involving the body and angle of the mandible on the right encompassing the right inferior alveolar nerve canal (arrow). Absence of root resorption (asterisks). b Multiplanar reformatted CT image (bone window) shows an unilocular cystic expansile lesion extending into the right inferior alveolar nerve canal (arrowhead). No periosteal reaction or pathological fracture. T1 (c) and T2 (d) axial images reveal thinned cortex (arrows) with postero-inferior cortical breach. e DWI reveals high signal on the b = 1000 image (arrowhead, upper image part) and low signal on the ADC map (asterisk, lower image part, ADC = 0.7 × 10−3 mm2/s), compatible with restricted diffusion due to intralesional ortho-/parakeratin accumulation and/or haemorrhage. f Subtraction image (T1 post-contrast and T1 pre-contrast) in the sagittal oblique plane shows only a thin enhancing lesion rim (arrowheads)