Fig. 3
From: Cross-sectional imaging in cancers of the head and neck: how we review and report
Patient with cancer of the right pyriform sinus. Contrast–enhanced CT scan a showing asymmetrical thickening of the pyriform sinus (arrow) on the right. CT scan at a lower level b showing slight thickening of the posterolateral hypopharyngeal wall (arrowhead) and an adjacent normal sized lymph node with central necrosis (arrow) indicating metastasis