Muller-Suur and Tyden (1985) defined the pathological limit for renal pelvis as a diameter greater than 17 mm.
Erickson et al. (1979), beginning with the 2nd trimester, suggest a limit of 27 mm on the right and 18 mm on the left. Brandt and Desroches (1985) retained the same references for the 2nd and 3rd trimesters, with the pathological limits of 18 mm on the right and 15 mm on the left for the 1st trimester. Finally, discovery of ureter dilatation extending to the pelvic ureter most often indicates pathological dilatation (Saidi et al. 2005).
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