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MBBS QUESTION #10203
Question 1
A patient presents with sudden severe flank pain radiating to the groin, consistent with a ureteric calculus. At which of the following sites is the stone most likely to become impacted, given the normal anatomical constrictions of the ureter?
  • The pelviureteric junction, the point where the ureter crosses the pelvic brim/iliac vessels, and the vesicoureteric junction✔️
  • Only at the renal pelvis itself
  • Only at the bladder neck
  • Only at the level of the second lumbar vertebra
Correct Answer Explanation
The ureter has three normal constrictions where calculi most often lodge: the pelviureteric junction, the crossing of the iliac vessels at the pelvic brim, and the vesicoureteric junction as it enters the bladder — knowledge that guides interpretation of imaging in suspected renal colic.