How is Bilateral Renal Agenesis diagnosed?

Bilateral Renal Agenesis is typically diagnosed prenatally via a routine ultrasound, which reveals the absence of both kidneys and severe oligohydramnios (low amniotic fluid). Postnatal diagnosis involves a physical examination, clinical assessment of respiratory function, and confirmatory imaging studies, such as a formal renal ultrasound or MRI, to verify the lack of renal tissue.

How is Bilateral Renal Agenesis identified?

Because Bilateral Renal Agenesis is a life-limiting condition, diagnosis often occurs during the second trimester of pregnancy. Clinicians look for a "collapsed" bladder and an inability to visualize the fetal kidneys. After birth, the diagnosis is confirmed by specialized pediatric teams. The process usually involves:

• Prenatal Ultrasound: The primary tool for identifying Bilateral Renal Agenesis, often showing absent kidneys and absent bladder.


• Clinical Physical Examination: Assessing for Potter sequence features, including characteristic facial dysmorphism and pulmonary hypoplasia.


• Postnatal Imaging: Neonatal renal ultrasound or MRI to definitively rule out the presence of ectopic or hypoplastic renal tissue.


• Genetic Counseling: Testing to determine if Bilateral Renal Agenesis is part of a broader genetic syndrome.

Which specialists are involved in the diagnosis?

A diagnosis of Bilateral Renal Agenesis is usually coordinated by a multidisciplinary team including maternal-fetal medicine specialists (perinatologists), pediatric nephrologists, and medical geneticists. If your local care team is unfamiliar with this rare presentation, it is vital to seek a consultation at a tertiary academic medical center with experience in congenital anomalies of the kidney and urinary tract (CAKUT).

What conditions are in the differential diagnosis?

Clinicians must distinguish Bilateral Renal Agenesis from other conditions that cause similar findings, such as severe multicystic dysplastic kidney disease, bilateral renal hypoplasia, or obstructive uropathy. While the "diagnostic odyssey" is often shorter for this condition due to its severity, the emotional weight of a diagnosis remains significant. Our DiseaseMaps.org community, which includes 19 members affected by Bilateral Renal Agenesis, emphasizes the importance of specialized support during this difficult time.

Next steps

• Consult with a board-certified pediatric nephrologist or geneticist for a formal evaluation.


• Request a referral to a high-risk obstetric center if the diagnosis is suspected during pregnancy.


• Connect with the 19 members of the Bilateral Renal Agenesis community at DiseaseMaps.org for peer support.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Bilateral Renal Agenesis.


• Orphanet: Renal Agenesis (ORPHA:796).


• OMIM (Online Mendelian Inheritance in Man): Renal Agenesis, Bilateral (Entry #266900).


• National Kidney Foundation: Information on Congenital Anomalies of the Kidney and Urinary Tract (CAKUT).