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Bilateral absence of the internal carotid artery: MR angiography and ultrasound findings

Monash Medical Centre, 246 Clayton Road, Clayton, Victoria, Australia 3168

View larger version (140K): [in a new window]   Figure 1. Lateral MR angiography projection showing absent anterior circulation below the circle of Willis.

View larger version (140K): [in a new window]   Figure 2. Anteroposterior MR angiography projection showing absent anterior circulation below the circle of Willis.

View larger version (218K): [in a new window]   Figure 3. Axial MR angiography at C1 level showing absent internal carotid artery flow voids.

View larger version (206K): [in a new window]   Figure 4. Axial MR angiography at level of cavernous sinuses showing absent internal carotid artery flow voids.

View larger version (130K): [in a new window]   Figure 5. Normal MR angiography lateral projection from a 14-year-old patient.

View larger version (143K): [in a new window]   Figure 6. Normal MR angiography anteroposterior projection from a 14-year-old patient.

View larger version (188K): [in a new window]   Figure 7. Axial T2 weighted image showing large calibre basilar artery and absent internal carotid artery flow voids.

View larger version (179K): [in a new window]   Figure 8. Axial T2 weighted image in a normal patient demonstrating normal calibre basilar artery and internal carotid artery flow voids.

View larger version (131K): [in a new window]   Figure 9. Ultrasound of left vertebral artery showing diffuse increased calibre.

View larger version (134K): [in a new window]   Figure 10. Ultrasound of left common carotid artery showing diffuse reduced calibre.