Fig. 18
A 54-year-old man with a recurrent lower lip squamous cell carcinoma with perineural tumour spread along the inferior alveolar nerve. a Axial contrast-enhanced CT scan and (b) reformatted coronal bone window CT image show an enhancing subcutaneous nodule (white arrow in a) in the lower lip that appeared 2 years after the removal of a squamous cell carcinoma in this region. The relapsing tumour spread through the inferior alveolar nerve, causing widening of the inferior alveolar canal (black arrow in a), and through the mandibular nerve, causing widening of the foramen ovale (arrow in b)