Figure 1From: Aetiological factors and imaging program for severe radiation-induced extracranial carotid stenosis in nasopharyngeal carcinomaClassification-tree for development of severe radiation-induced carotid stenosis. The uppermost number shown inside each square indicates the total number of patients at each node. The first number inside the parentheses represents the number of patients with no/mild/moderate outcome, the second shows the number with severe outcome. Age ≥ 57.Back to article page