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Fig. 2 | Insights into Imaging

Fig. 2

From: Easily detected signs of perineural tumour spread in head and neck cancer

Fig. 2

Axial CT (a) and coronal reformatted CT (b) images show obliteration of the fat pad anterior to the superior orbital rim (arrow in a) and superior to the levator palpabrae muscle (white arrow in b) when compared to its normal appearance (black arrow in b). The coronal (c) and sagittal (d) T1 weighted images in a different patient reveal obliteration of the fat pad superior to the left levator palpebrae muscle (white arrows in c and d) in the expected location of V1, compared to the normal fat pad on the right side (black arrow in c). Notice also the obliteration of the fat pad anterior to the supraorbital foramen (arrowhead in d). These signs are indicative of PNTS along V1 in both of these patients with a history of excised skin cancer on the forehead and V1 numbness

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