Fig. 1
Representative true positive imaging findings of retropharyngeal lymph node. a Contrast-enhanced computed tomography shows a left metastatic retropharyngeal lymph node (arrow). b T1-weighted gadolinium-enhanced magnetic resonance imaging shows a left metastatic retropharyngeal lymph node (arrow). c Positron emission tomography-computed tomography shows an abnormal 18fluorine-fluorodeoxyglucose uptake with a standardized uptake value of 3.1, on a left retropharyngeal lymph node (arrow)