Case 1: Hypoplasia of the left ICA

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High-signal-intensity lesions on T2-weighted MR images

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Presentation transcript:

Case 1: Hypoplasia of the left ICA Case 1: Hypoplasia of the left ICA. A, Source image from a 3D time-of-flight MR angiogram shows diminished flow-related signal intensity within the petrous portions of the left ICA (arrow).B, Compressed image from the MR angiogram shows a tortuous, enlarged... Case 1: Hypoplasia of the left ICA. A, Source image from a 3D time-of-flight MR angiogram shows diminished flow-related signal intensity within the petrous portions of the left ICA (arrow).B, Compressed image from the MR angiogram shows a tortuous, enlarged PCOM (arrow) extending forward to supply the left MCA. The left ACA is supplied via a patent ACOM (arrowhead). There is no perceivable flow-related signal intensity within the supraclinoid left ICA on the compressed image.C, Axial image from a CT angiogram at the level of the petrous ICA shows hypoplasia of the left carotid canal (arrowhead). Curtis A. Given II et al. AJNR Am J Neuroradiol 2001;22:1953-1959 ©2001 by American Society of Neuroradiology