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1. Multicystic dysplastic kidney, hydronephrotic type

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Figure 45-1

Multicystic dysplastic kidney, hydronephrotic type.

A longitudinal sonographic image shows multiple noncommunicating cysts of varying sizes. There is a dominant central cyst at the expected location of the renal pelvis.

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2. Multicystic dysplastic kidney

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Figure 45-2

Multicystic dysplastic kidney.

A longitudinal sonographic image of the left flank of a 3-month-old infant shows multiple noncommunicating cysts and no normal renal tissue.

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3. Multicystic dysplastic kidney

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Figure 45-3

Multicystic dysplastic kidney.

This lesion consists of a single large central cyst (arrows) and a small adjacent communicating cyst inferiorly.

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4. Autosomal recessive polycystic kidney disease

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Figure 45-4

Autosomal recessive polycystic kidney disease.

An abdominal radiograph of a neonate with Potter facies and respiratory distress shows marked bilateral flank fullness, diaphragm elevation, and small lungs. There is displacement of gasfilled loops of intestine into the central aspect of the abdomen.

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5. Autosomal recessive polycystic kidney disease

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Figure 45-5

Autosomal recessive polycystic kidney disease.

An anterior transverse sonographic image of the midportion of the abdomen shows marked bilateral nephromegaly and renal parenchymal hyperechogenicity.

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6. Autosomal recessive polycystic kidney disease

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Figure 45-6

Autosomal recessive polycystic kidney disease.

A longitudinal sonographic image of a 2-month-old infant with bilateral flank masses shows an enlarged kidney, coarse hyperechogenicity of the medulla, and distortion of the collecting system. Relative sparing of the cortex results in a hypoechoic rim.

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7. Autosomal recessive polycystic kidney disease

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Figure 45-7

Autosomal recessive polycystic kidney disease.

A longitudinal sonographic image of a newborn shows nephromegaly, marked parenchymal hyperechogenicity, small medullary cysts, and a relatively hypoechoic peripheral cortical rim.

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8. Autosomal recessive polycystic kidney disease

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Figure 45-8

Autosomal recessive polycystic kidney disease.

This is a newborn infant with a history of oligohydramnios and bilateral nephromegaly on prenatal ultrasound. A longitudinal image of the right kidney obtained with a high frequency transducer shows innumerable medullary cysts, including a few larger cysts (C) that measure up to several millimeters in diameter. The medullary region of the kidney is expanded and echogenic. There is a peripheral hypoechoic margin of cortex (arrows).

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