In 1925 we1 reported our observations on dilatation of the ureter and kidney pelvis during pregnancy in a group of cases studied by retrograde pyelography. The cases were divided into three groups:
In group 1 were eleven cases of acute pyelitis during pregnancy. In every case either bilateral or unilateral dilatation was found of from marked to enormous degree.
Group 2 consisted of nineteen cases of normal pregnancy with normal urine. In sixteen of these cases, or 84.16 per cent, either unilateral or bilateral dilatation was found.
In group 3 were six patients who gave a history of a pyelitis either before marriage or during a previous pregnancy but who were normal at the time of the investigation. Bilateral dilatation was found in two cases, unilateral in three cases and no dilatation in one case. The conclusion was reached that varying degrees of dilatation occur in approximately 80 per
KRETSCHMER HL, HEANEY NS, OCKULY EA. DILATATION OF THE KIDNEY PELVIS AND URETER DURING PREGNANCY AND THE PUERPERIUM: A PYELOGRAPHIC STUDY IN NORMAL WOMEN. JAMA. 1933;101(26):2025–2029. doi:10.1001/jama.1933.02740510017005
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