Will the fetus have renal pelvis separation? What are the causes of fetal renal pelvic separation?

Fetal renal pelvis separation is a relatively common phenomenon. There are two main causes of fetal renal pelvis separation. One is physiological, which is mainly caused by the baby holding urine. Under normal circumstances, it will return to normal as long as the baby urinates once. One is pathological, for example, if a pregnant woman has diabetes resulting in polyhydramnios, or urinary system malformation, both of these can lead to renal pelvic separation. The following will give you a detailed introduction!

1. Physiological causes of fetal renal pelvic separation

Fetal renal pelvis separation is caused by kidney stones and ureteral malformations, which prevent urine from being discharged normally, causing the renal pelvis to become filled and enlarged. When the fetus holds urine, it may sometimes be caused by a naughty baby holding urine. Holding urine causes the bladder to fill with a large amount of urine, resulting in varying degrees of increased pressure in the renal pelvis. The renal pelvis separation caused by this condition can heal on its own.

If the baby's renal pelvis separation value is within the normal range, then the mother does not need to worry, as the baby is most likely suffering from renal pelvis separation due to holding urine. Renal pelvic separation that occurs during pregnancy may decrease or disappear in the later stages. Mothers can consider a follow-up examination after a period of time. If renal pelvic separation persists but does not exceed the normal range, the baby will generally return to normal after urinating once after birth.

2. Pathologically induced fetal renal pelvic separation

1. Excessive amniotic fluid. If the pregnant mother suffers from gestational diabetes, it will cause excessive amniotic fluid, which may cause kidney malformation in the fetus and lead to hydronephrosis. Causes separation of the renal pelvis.

2. Urinary system malformations. Among congenital urinary system malformations, kidney and ureteral malformations are the most common. Renal malformations include cystic kidney disease, horseshoe kidney, solitary kidney, etc. Congenital ureteral malformations are common, including complete absence of ureters, such as: double ureteral malformation, ureterocele, ectopic ureteral opening, retrocaval ureter, ureter-pelvic junction malformation, etc. If the fetal renal pelvis separation is larger than 1 cm, it may be caused by urinary system malformation.

3. Will fetal renal pelvic separation disappear?

Renal pelvic separation caused by physiological reasons will disappear, but renal pelvic separation caused by pathological reasons will not disappear.

Renal pelvic separation refers to a situation in which the connection between the kidney and the ureter is blocked due to physiological or pathological factors, resulting in inability to urinate normally and the kidney becoming filled and swollen. Physiological factors are generally caused by fetal urine retention in the uterus, while pathological factors are caused by excessive amniotic fluid or congenital ureteral malformations. Therefore, renal pelvic separation caused by physiological reasons will disappear, but renal pelvic separation caused by pathological reasons will not disappear.