Accessory Navicular Bone

The navicular accessory bone is located at the medial aspect of the navicular bone proper. Its

Accessory Bone

Fig. 5.18A, B Vertical linear uptake in calcified femoral arteries. A Anterior scintigraph of both thighs shows long linear uptake in the medial aspects of both thighs (ar

Femoral Artery Calcification

Fig. 5.18A, B Vertical linear uptake in calcified femoral arteries. A Anterior scintigraph of both thighs shows long linear uptake in the medial aspects of both thighs (ar rows). B AP radiograph reveals diffusely calcified femoral arteries (arrows)

Ectopic Kidney
Fig. 5.19A, B Horseshoe kidney and ectopic kidney. scintigraph of the left lower abdomen reveals an ectopic A Posterior scintigraph of the abdomen shows horse- kidney (arrow) and bladder connected by a short ureter shoeing of the kidney with fused isthmus. B Anterior
Retrocaval Ureters Mri

Fig. 5.20A, B Retrocaval ureter. A Posterior scintigraph of the abdomen shows moderate dilatation of the right renal calices, pelvis, and ureter due to ureteral obstruc tion at the L4-5 level (arrow). B MRI reveals compression of the right ureter by the inferior vena cava and dilated proximal ureter with kinking (arrow)

Fig. 5.20A, B Retrocaval ureter. A Posterior scintigraph of the abdomen shows moderate dilatation of the right renal calices, pelvis, and ureter due to ureteral obstruc tion at the L4-5 level (arrow). B MRI reveals compression of the right ureter by the inferior vena cava and dilated proximal ureter with kinking (arrow)

occurrence is either unilateral or bilateral (Lawson et al. 1984). Our recent scintigraphic study of 200 consecutive patients, 92 men and 108 women, with ages ranging from 20 to 68 years, showed the incidence of bilateral and unilateral accessory navicular bone(s) to be 0.5% and 3.5%, respectively, without gender predilection (Fig. 9.51).

gin. Horseshoe kidney (Fig. 5.19A), ectopic kidney (Fig. 5.19B), and retrocaval ureter (Fig. 5.20) belong to the former category and renal tumors, ureteral obstruction, vesicoure-teral reflux (Fig. 5.21A), and ureterocele (Fig. 5.21B) belong to the latter.

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