Ultrasound evaluation of hydronephrosis of pregnancy

Abstract

Four hundred ninety-two patients, including 449 pregnant patients, 39 nonpregnant control patients, and 4 patients with pelvic masses, had renal ultrasonography using gray scale technique. Measurements of renal pelvic diameters in the normal pregnant patients revealed an overall incidence of 63 percent renal pelvic dilatation over the nonpregnant controls. Maximum normal renal pelvic diameters were 1.1 cm on the right and 0.9 cm on the left. The maximum normal expected renal pelvic diameter (97.5 percent confidence level) in pregnancy is 2.7 cm on the right and 1.8 cm on the left in the last two trimesters of pregnancy. There was no significant difference between primiparous and multiparous patients, but pregnant patients were significantly different from controls in every trimester (p less than 0.01). Maximum dilatation occurred at 24--28 weeks of gestation. The right renal pelvis was enlarged to the greatest degree in 90 percent of normal patients. Patients with pelvic masses showed a similar pattern of right-sided hydronephrosis.

Ultrasonic Evaluation of Hydronephrosis during Pregnancy and Puerperium

“…We found the overall incidence of hydronephrosis to be consistent with published studies (table 1) [2,3,5,8]. We also found a predominance of right kidney affections (table 2).…”

“…From the present study the calyceal diameter of ap proximately 50 mm, as 27 mm reported by Erickson et al [2], in the right kidney and 22 mm in the left kidney does not always indicate the presence of a pathology. Conse quently, these patients should receive special attention relative to hydronephrosis from the first trimester through early postpartum.…”

“…With the advent of ultrasound, we are now able to test safely, and are beginning to read reports about hydronephrosis dur ing pregnancy [2,3,[5][6][7][8][9]. 96 Mu rao Ultrasonic Evaluation of Hydronephrosis…”

Urolithiasis in pregnancy. I: pathophysiology, fetal considerations and diagnosis

“…Muller‐Suur and Tyden [40] measured the renal pelvic diameter and recommended renography in symptomatic patients with a renal pelvic diameter of > 17 mm. In contrast, Erickson et al [41] found a maximum pelvic diameter of 27 mm on the right side and 18 mm on the left side during last two trimesters of pregnancy in asymptomatic patients.…”

Focus: urological emergencies during pregnancy

“…Erickson et al [12], retiennent à partir du deuxième trimestre, 27 mm à droite et 18 mm à gauche. Brandt et Descroches [13] retiennent les mêmes référen-ces pour le deuxième et le troisième trimestres, les limites pathologiques étant de 18 mm à droite et 15 mm à gauche pour le premier trimestre.…”