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CAKUT — the birth defects behind most childhood kidney disease: hypoplasia, obstruction, posterior urethral valves, and reflux. Prenatal detection and what outcomes look like.
Evidence reviewed & updated: 2026-08 — reflects the latest published trials and guidelines.
CAKUT is the umbrella for birth defects of the kidneys and urinary tract — the cause of about half of pediatric CKD and a large share of childhood-onset kidney failure. The spectrum runs from mild (harmless reflux) to severe (posterior urethral valves, bilateral hypoplasia). Prenatal ultrasound detects many cases, and outcomes depend on early detection and protecting remaining function.
CAKUT covers everything from a harmless duplex kidney to posterior urethral valves (PUV) — the classic severe defect in boys that obstructs urine flow and damages the bladder and kidneys before birth. Vesicoureteral reflux (urine flowing backward into kidneys) is common and often mild, but with severe reflux or scarring, it drives CKD.
Hypoplasia and dysplasia (small, underdeveloped kidneys) may be found incidentally at any age — on an ultrasound for UTIs or abdominal pain.
Prenatal ultrasound detects most significant CAKUT — hydronephrosis (dilated renal pelvis) is the flag that triggers postnatal evaluation. The postnatal ladder: repeat ultrasound, VCUG (contrast bladder study for reflux/valves), and DMSA/MAG3 scans (function and obstruction) — matched to severity.
Many cases are mild and need only monitoring; severe ones (PUV, bilateral obstruction) need surgical relief, often in the first weeks-months of life, to protect the remaining nephrons.
The prognosis is largely set by how much kidney function exists early: children who keep eGFR >50% of expected in early life generally do well, with slower progression; those with severe dysplasia and PUV progress faster. Whatever remains, the playbook is nephroprotection: BP control, monitoring proteinuria, avoiding nephrotoxins, and growth support.
Family planning: most CAKUT is sporadic (recurrence ~3-5%), though some genetic syndromes carry higher risk — genetics counseling is appropriate with extra-renal features or family history.
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