What is the normal range for fetal hydronephrosis?

Patient's question:

Your friend is currently 30 weeks pregnant, and the fetus has 2.1 cm hydronephrosis in the right kidney. The doctor said the child can survive after birth, but it will be affected by the right kidney. Your friend wants to consult the following: With this condition progressing, will the kidney still be preserved when the baby is born? Is there any such case in the past?

Doctor's answer:

Because some hydronephrosis may disappear spontaneously with further early pregnancy or after birth. Most urinary system obstructions can be effectively treated through postnatal careful examination. Some developed countries even perform in utero surgery for severely hydronephrotic fetuses, primarily drainage surgery to alleviate pressure on the kidneys, followed by postnatal surgical intervention. However, for most children, close follow-up after birth and timely implementation of necessary examinations are required for early treatment.

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