Fig. 5From: Easily detected signs of perineural tumour spread in head and neck cancerAxial CT image (a) in a patient with lower face numbness reveals obliteration of the fat pad at the right mental foramen at the expected location of the mental nerve (long arrow in a) with a large primary tumour seen at the right retromolar trigone (arrowhead in a). This is an example of antegrade PNTS. Axial CT (b) and T1-weighted (c) images in a different patient illustrate a more subtle obliteration of the fat pad anterior to the right mental foramen (arrow in b and c). This becomes more apparent when a comparison to the normal left-sided fat pad (arrowheads in b and c) is made. This patient was asymptomatic and had a history of lip cancer removalBack to article page