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1. Azygous anterior cerebral artery

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Figure 20-1

Azygous anterior cerebral artery.

MRA shows a single midline anterior cerebral artery (arrow) supplied by normal right and left A1 segments.

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2. Fetal origin of the posterior cerebral artery

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Figure 20-2

Fetal origin of the posterior cerebral artery.

An oblique MRA image shows the right posterior cerebral artery (large arrow) to arise from the internal carotid artery. The left PCA (small arrow) arises from the basilar artery.

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3. Cerebral arteriovenous malformation

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Figure 20-3

Cerebral arteriovenous malformation.

A. A T1-weighted MR image of a 14-year-old child with recent onset headaches shows a superficial "mass" (arrow) composed of multiple flow voids. The lesion has a triangular shape, with the peripheral aspect wider than the central aspect. B. A sagittal T1-weighted image demonstrates hyperintense blood products (arrow) at the inferior-lateral margin of the lesion. C. The nidus of the malformation enhances intensely with intravenous gadolinium. D, E. Anterior and lateral MRA images confirm that the nidus consists of a tangle of vessels with arterial flow (arrow). The predominant feeding arteries arise from the right middle cerebral and posterior cerebral arteries. There is also supply from the right pericallosal artery.

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4. Vein of Galen aneurysmal dilation

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Figure 20-4

Vein of Galen aneurysmal dilation.

A contrast-enhanced CT image shows multiple dilated and tortuous vessels in a right thalamic AVM. Drainage through the vein of Galen and straight sinus results in marked dilation of these structures.

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5. Vein of Galen aneurysmal malformation

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Figure 20-5

Vein of Galen aneurysmal malformation.

Rapidly flowing blood in the varix produces a flow void on this T1-weighted MR image. The posterior extension of the varix is more superior than expected for a dilated straight sinus. The anterior aspect of the varix compresses the tectum. The basilar artery is dilated and tortuous.

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6. Venous angioma

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Figure 20-6

Venous angioma.

A lateral image from the venous phase of a cerebral angiogram shows a network of thin veins (arrows) that empty into an enlarged draining vein.

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7. Venous angioma

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Figure 20-7

Venous angioma.

A. Unenhanced CT of a 17-year-old boy with headaches shows a small focus of calcification (arrow...

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