Thanks for your query.Ultrasound
scan of your wife who is in 35 weeks pregnancy
suggest extrareanl pelvis and dilatation of Renal pelvis
.This indicates Pelvi Ureteric Junction Obstruction. whereby there is narrowing of the junction of Renal Pelvis and Ureter,If this is complete it may obstruct the drainage
of the urine from that kidney in to the bladder which over a period of time will damage the kidney. Once the baby is born you have to do few investigations like Intravenous Pyelography,DTPA Renal scan and ultrasound scan to ascertain the degree of obstruction.Further treatment will be decided on findings of above tests.So consult some Urologist
after the birth of a baby.