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Urogenital Imaging

Calculus, ureteric

stone formation in the ureter, nearly always secondary to stones which form in the kidney and then pass into the ureter (see calculus renal). Very occasionally, stones form directly in the ureter. Such primary ureteric calculi may occur with structural ureteric abnormalities (such as ureterocoele, blind-ending ureter, ectopic ureter, ureteric diverticulum, and ureteric stricture) or with inflammatory or parastic disorders of the ureter. The imaging findings are those of a ureteric filling defect, combined with the imaging findings of the underlying ureteric abnormality (Fig.1) (Fig.2) (Fig.3).

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Fig.1

a. Plain radiograph showing a small calcification (arrow) projected over the right pelvis. b. Intravenous urogram confirms that calcification represents a small obstructive stone at the right ureterovesical junction.
Calculus, ureteric, Fig.1 (a)
Calculus, ureteric, Fig.1 (b)
Calculus, ureteric, Fig.2
Calculus, ureteric, Fig.3