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Chapter 44

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1. Fossa navicularis

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Figure 44-1

Fossa navicularis.

A voiding urethrogram image of a 4-year-old boy shows the normal fossa navicularis (arrow) as focal enlargement of the lumen just proximal to the meatus.

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2. Caudal ectopic kidney

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Figure 44-2

Caudal ectopic kidney.

A coronal T2-weighted fat-suppressed MR image shows an upper pelvic "mass" due to an ectopic right kidney (arrows). The leftkidney was in a normal location.

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3. Caudal ectopic kidney

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Figure 44-3

Caudal ectopic kidney.

A delayed contrast-enhanced CT image of the pelvis demonstrates an ectopic right kidney. There is anomalous rotation of the kidney, with the pelvis directed to the right. The contrast-opacified ureter from the normal leftkidney is visible.

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4. Cranial ectopic kidney

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Figure 44-4

Cranial ectopic kidney.

A lateral view from an excretory urogram shows the right kidney (arrows) to extend into the inferior aspect of the thorax.

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5. Crossed ectopic kidney

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Figure 44-5

Crossed ectopic kidney.

A. The ectopic leftkidney (long arrows) is posterior to the right kidney (short arrow) on this axial contrast-enhanced CT image. B. There is an abnormal transverse orientation of the ectopic leftkidney (long arrows). This coronal image shows that both kidneys are caudally ectopic (short arrows indicate the inferiorly positioned right kidney).

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6. Crossed ectopic kidney

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Figure 44-6

Crossed ectopic kidney.

IV urography shows 2 pelvicalyceal systems and ureters on the right and none on the left. There is malrotation of the inferior kidney.

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7. Crossed fused renal ectopia

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Figure 44-7

Crossed fused renal ectopia.

An anterior scintigraphic image shows malposition of the leftkidney inferiorly and to the right. A portion is contiguous with the lower pole of the right kidney. Radiopharmaceutical is present in 2 distinct renal pelves.

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8. Crossed fused ectopic leftkidney

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Figure 44-8

Crossed fused ectopic leftkidney.

A, B. Coronal and axial T2-weighted fat-suppressed MR images of a 14-year-old patient with no urinary system symptoms show an L-shaped ectopic leftkidney (arrows) that is fused to the lower pole of the normally positioned right kidney. There is abnormal rotation of the ectopic kidney, such that the renal pelvis is anterior.

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