Retention of infected urine in the uppar urinary tract which is due to
obstruction is a serious condition during pregnancy, The authors repo
rt their experience on five cases and propose attitudes to adopt again
st such emergency, Ultrasounds allow occurate diagnosis of the obstruc
tion and may be helpful to find its etiology, Plain X ray film could b
e of interest mainly for stone recognition after the third month of ge
station, Surgical treatment, when possible allows either relief of obs
truction and cure of the original disease, otherwise performance of pe
rcutaneous neph rostomy represents a better way of drainage until the
end of pregnancy.