Fig. 8

A 41 year-old-male patient diagnosed with left sided nasopharyngeal carcinoma and intracranial involvement. Axial CT of the neck (a) at the time of diagnosis (5/2005) showing normal posterior contour of the tongue (red line). The patient received radiotherapy and chemotherapy ending in 2006. Follow-up axial fused PET/CT images of the neck region (b) on (8/2013) shows interval atrophy of the left hemi-tongue, with abnormal posterior contour (green line). Post contrast coronal T1 WI before treatment (c), coronal fused PET/CT and coronal contrast enhanced MRI T1W images after treatment (d, e) confirming the left hemi tongue atrophy (arrow). Clinically, the patients tongue deviates to the left. The constellation of findings is consistent with post radiation hypoglossal neuropathy