Renal pelvicalyceal dilation in antepartum pyelonephritis: Ultrasonographic findings

Diane Twickler, Bertis B. Little, Andrew J. Satin, Charles E L Brown

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The purpose of the present study was to determine whether pregnant women with pyelonephritis have differences of pelvicalyceal systems, compared with normal pregnant control subjects, that might predispose to upper urinary tract infection. Ultrasonographic examination of both kidneys in coronal and axial planes of 24 women with clinical pyelonephritis and positive urine cultures was compared with results in control subjects matched for gestational age, parity, and race. Women with right or bilateral pyelonephritis had increased dilation of the right calyceal system, compared with controls (1.7 cm vs 0.8 cm, p < 0.001). Renal pelvis volume was increased as well (29.3 vs 5.5 cm3, p < 0.001). Renal pelvicalyceal dilation in antepartum pyelonephritis was significantly increased compared with normal physiologic dilation of pregnancy. Follow-up nephrosonography in a small number of women (N = 10) after treatment of pyelonephritis did not reveal a consistent decrease in renal dilation, suggesting that dilation of the renal pelvis may antedate pyelonephritis. Further study of this phenomenon is warranted.

Original languageEnglish (US)
Pages (from-to)1115-1119
Number of pages5
JournalAmerican journal of obstetrics and gynecology
Issue number4 PART 1
StatePublished - Oct 1991


  • Pyelonephritis
  • hydronephrosis
  • nephrosonography

ASJC Scopus subject areas

  • Obstetrics and Gynecology


Dive into the research topics of 'Renal pelvicalyceal dilation in antepartum pyelonephritis: Ultrasonographic findings'. Together they form a unique fingerprint.

Cite this