Figure 4a. Esophagitis in a 63-year-old woman with nasopharyngeal carcinoma who presented with complaints of xerostomia and dysphagia. The patient was undergoing chemotherapy and radiation therapy. (a) Coronal staging CT scan shows mild esophageal thickening involving the middle to distal esophagus (arrow). (b, c) Coronal fused PET-CT image (b) and PET scan (c) demonstrate linear low-level FDG uptake (arrow), a finding that corresponds to the esophageal thickening seen at CT.