Fig. 1From: Prognostic significance of cervical radiologic carotid artery invasion by lymph node on magnetic resonance imaging in nasopharyngeal carcinomaMRI scans of one patient showing lymph node metastases involving the carotid artery. a-bĀ Axial contrast-enhanced T1WI and T2WI showingā>ā180 degree of encasement of the internal carotid artery with a blurred fat plane (black arrow) andā<ā180 degree of encasement of the external carotid artery (white arrow) at the left side. cĀ Sagittal contrast-enhanced T1WI showing the length of carotid involvement at the left side, measuring 66.7Ā mmBack to article page