Jul 5 th, 2024

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Pregnancy is a time of immense joy and anticipation, but it can also bring anxiety, especially when an ultrasound reveals unexpected findings. One such finding that can worry expecting mothers is fetal renal pyelectasis, a condition characterized by swelling in the baby’s kidneys. Let’s delve into a common concern and provide clarity based on a real scenario and expert medical advice.

Connecting with Experienced Physicians

We understand the importance of timely and accurate medical advice. We collaborate with experienced physicians who take out some of their precious time to help and advise people who have medical concerns. These dedicated professionals are deeply committed to social causes and strive to make a positive impact on the community. Here is an example of a recent inquiry from one of our users

Kidney Swelling Questions

User Inquiry

A 9-month pregnant woman recently received an ultrasound report indicating a 3-millimeter swelling in her baby’s kidneys. With only two weeks left until delivery, she was understandably anxious and sought medical advice.

Expert Medical Advice

Dr. Ruchika Tahilyani, a consultant foetal medicine specialist in Lucknow, India provided a reassuring response:

“Hello dear, Fetal renal pyelectasis (kidney swelling) is a cause for worry only if it is more than 7mm in the anterior-posterior plane at more than 28 weeks of pregnancy. So, in your case, if it is 3mm, then it should be normal. If you are still worried, then a post-delivery baby ultrasound of the kidneys will crosscheck it and reassure you. Hope that answers your query.”

Understanding Fetal Renal Pyelectasis

Fetal renal pyelectasis refers to the dilation of the renal pelvis in the fetus. This condition is detected during routine prenatal ultrasounds and can cause significant concern for parents. However, the severity and implications vary based on the measurements and the gestational age at which it is detected.

What the Measurements Mean

Normal vs. Abnormal: Swelling of up to 4-5mm is generally considered normal during pregnancy. Anything above 7mm in the anterior-posterior plane after 28 weeks may require further evaluation.


Mild Swelling: As in the case above, a 3mm swelling is typically considered normal and not a cause for immediate concern.

Next Steps and Reassurance

If you find yourself in a similar situation, here’s what you can do:

Post-Delivery Ultrasound: After your baby is born, a follow-up ultrasound can provide a definitive assessment of the kidneys.


Consult Your Pediatrician: Discuss the findings with your pediatrician to understand any potential implications and necessary follow-up.


While fetal renal pyelectasis can be a source of worry, it’s important to understand the context and measurements. In many cases, such as the one shared, mild swelling is normal and does not indicate a serious issue. Always consult with your healthcare provider for personalized advice and follow-up care.

At, we are committed to providing accurate, compassionate advice to help you navigate your health concerns with confidence with the help of expert physicians. If you have more questions or need further reassurance, don’t hesitate to reach out to our dedicated team of physicians.

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