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Fetal left kidney not seen (20 weeks)
Hello doctor,
I am 20 weeks pregnant. In my anomaly scan, the report says:
• Non-visualization of left kidney in left renal fossa
• Right kidney shows mild pelviectasis (5.2 mm)
• Amniotic fluid normal
• Bladder visualized
At my 13-week scan, bladder/kidneys mentioned as visible.
My concerns:
1. Could the left kidney be pelvic/ectopic and visible in later scans and will it be functional?
2. Is unilateral renal agenesis likely in this situation?
3. Does normal amniotic fluid indicate the single kidney is functioning well?
4. What follow-up scans should be done and at what weeks?
5. Is any treatment needed during pregnancy?
6. What is the prognosis for the baby after birth?
I have also undergone amniocentesis and awaiting results. Whether this will detect all gender abnormalities?
Please guide me on the next steps and whether I should consult a fetal medicine specialist or pediatric nephrologist during pregnancy.
Answers (6)
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Based on the scan details:
• Normal amniotic fluid and a visualized bladder are reassuring and usually indicate that at least one kidney is functioning well.
• Non-visualization of one kidney can be due to ectopic/pelvic kidney or unilateral renal agenesis; both are possibilities at this stage.
• A pelvic/ectopic kidney may be seen on repeat targeted scan later and can be functional.
• Mild pyelectasis (5.2 mm) of the right kidney is common and often resolves on its own.
Next steps:
Do a targeted fetal anomaly scan / follow-up ultrasound at 28–32 weeks.
Continue routine antenatal care; no treatment is needed during pregnancy if fluid remains normal.
Fetal medicine specialist consultation is advised; pediatric nephrology input is usually needed after birth, not urgently now.
Postnatal ultrasound will confirm kidney status and function.
Prognosis:
Babies with a single functioning kidney usually have a good outcome and normal life, with long-term follow-up.
Amniocentesis will detect chromosomal abnormalities, but not all structural or functional kidney issues.
Please stay reassured and continue follow-up as advised.
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Dr. Pratibha P S
Gynecologist
10 yrs exp
Bangalore
normal
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Dr. Neha Vashisth
Obstetrician
12 yrs exp
Jaipur
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Dr. Ashritha Thadishetty
Gynecologist/Obstetrician
8 yrs exp
Hyderabad
Nothing if this is the only issue in the scan and remaining all are normal prognosis will be good and u can repeat scans and see further
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.