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1. Renal artery stenosis

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Figure 52-1

Renal artery stenosis.

The spectral waveform of the main renal artery interrogated distal to a severe focal stenosis shows low-velocity monophasic flow.

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2. Renal artery stenosis

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Figure 52-2

Renal artery stenosis.

A. An abdominal aortogram of a teenager with hypertension shows a focal stenosis of the right renal artery (arrow) and mild poststenotic dilation. B. The right kidney is smaller than the left and the intensity of the nephrogram is slightly less. C. A post-angioplasty image shows improvement in the caliber of the artery.

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3. Intimal fibroplasia

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Figure 52-3

Intimal fibroplasia.

Angiography shows severe circumferential stenosis of the left main renal artery and poststenotic dilation.

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4. Intimal fibroplasia

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Figure 52-4

Intimal fibroplasia.

An abdominal aortogram of a hypertensive child shows a long-segment stenosis of the distal two-thirds of the right renal artery (arrow). There is mild narrowing of the left renal artery as well.

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5. Middle aortic syndrome

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Figure 52-5

Middle aortic syndrome.

Aortography of a hypertensive infant shows bilateral renal artery stenoses and diffuse aortic narrowing.

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6. Takayasu arteritis

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Figure 52-6

Takayasu arteritis.

A. An oblique coronal dynamic contrast-enhanced MR image of a 16-year-old girl shows a small right kidney with no visible renal artery. There is narrowing at the origin of the superior mesenteric artery. B. A later image shows collateral flow through a tortuous ureteral artery (arrows).

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7. Left renal arterial thromboembolism

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Figure 52-7

Left renal arterial thromboembolism.

A coronal CT image of a neonate shows lack of contrast enhancement in most of the left kidney. The thin peripheral rim of enhancement due to preserved perfusion of the subcapsular cortex is typical of acute arterial obstruction.

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8. Extraparenchymal renal artery aneurysm

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Figure 52-8

Extraparenchymal renal artery aneurysm.

An oblique CT angiogram image shows an aneurysm (arrow) of the main renal artery. There is a stenotic lesion adjacent to the origin of the aneurysm.

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9. Renal artery aneurysm

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Figure 52-9

Renal artery aneurysm....

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