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Figure 3


Fig. 1C —27-year-old woman with exacerbated chronic headache. Coronal oblique 2D multiplanar reformation and 3D volume-rendered projections from contrast-enhanced MR angiography (A and C) and CT angiography (B and D) show small 2.3 x 2.1 x 2.4 mm (transverse x anteroposterior x craniocaudal) aneurysm arising from cavernous portion of right internal carotid artery. Aneurysm was detected by both readers on contrast-enhanced MR angiography but was not identified initially on CT angiograms by reader 2. Subsequent analysis of data set revealed that aneurysm (arrow) was clearly present on CT angiograms but was overlooked during initial reading.