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Collecting phase

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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During the collecting phase, contrast medium is passed into the renal pelvis. Particular examination is made of the calyceal tips.

Hydronephrosis, of increasing severity, is revealed by:

  • blunting of the calyces
  • clubbing
  • the "crescent" sign - contrast collects in the lower parts of grossly dilated calyces

Polycystic kidneys may demonstrate the "cookie cutter sign"; the cysts press into the renal pelvis to give the appearance of semi-circles having been cut out of the contrast in the renal pelvis.

Excretion of contrast down the ureters reveal any filling defects in them.

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