Question: what are constrictions of ureter?
Answer: Constrictions. The ureter has a diameter of 3 mm 1 but there are three constrictions, which are the most common sites of renal calculus obstruction: at the pelviureteric junction (PUJ) of the renal pelvis and the ureter. as the ureter enters the pelvis and crosses over the common iliac artery bifurcation.