Figure 4: (a-c) Axial, sagittal, and coronal reformations of CT neck angiogram showed intensely enhancing 0.5 × 1.3 × 3.1 cm retropharyngeal PTA (yellow arrows), superior to left thyroid lobe (*), previously had been dismissed as a reactive lymph node. Retrospective review revealed a prominent vessel coursing toward the lower pole of the PTA (red arrow) described as “polar vessel sign” in literature