Fig. 3
From: Easily detected signs of perineural tumour spread in head and neck cancer
Axial CT (a and b) and axial T1-weighted (c and d) images show obliteration of the preantral fat pad on the left (long white arrow in a and c) when compared to its normal appearance on the right (short white arrow in a and c). In addition, note the enhancing soft tissue within the maxillary sinus (black arrow in a) as well as the obliteration of the fat pad in the left pterygopalatine fossa (long white arrow in b and d) compared to its normal appearance on the right (short white arrow in b and d). The obliteration of the fat pad in the left pterygopalatine fossa (long white arrow) can also be well appreciated on coronal images (e). These signs are indicative of PTNS along V2 in this patient with history of left cheek skin cancer presenting with V2 numbness