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Urogenital Imaging

Blind-ending ureter

may be acquired or congenital. The acquired abnormality may follow nephrectomy. Three types of congenital blind-ending ureter may be encountered. The commonest type is due to early branching of single ureteric bud, so that the upper ureter is bifid, with one blind-ending component which is usually the superior component. The blind-ending segment in this situation constitutes a congenital ureteric diverticulum.

It can usually be recognized at intravenous urography, due to retrograde filling. Sometimes retrograde pyelography is required for diagnosis (Fig.1). In the second form of congenital blind-ending ureter, there is complete ureteric duplication, with the blind-ending ureter draining to an ectopic position in the bladder. Retrograde pyelography may be required for diagnosis. In the third form of congenital blind-ending ureter, the kidney is absent (see agenesis renal) and a single rudimentary blind-ending ureter is present. Again, retrograde pyelography may be required for diagnosis. Occasionally, these remnants may undergo dilatation and present as an abdominal mass.

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Fig.1

Left retrograde pyelogram showing a blind-ending ureter (arrow).
Blind-ending ureter, Fig.1