Overview
Congenital primary megaureter, nonrefluxing and unobstructed form, is a rare condition present from birth in which one or both ureters (the tubes that carry urine from the kidneys to the bladder) are abnormally wide (dilated), but without any physical blockage or backward flow of urine (reflux). This condition is sometimes called idiopathic or functional megaureter because the exact cause of the dilation is not fully understood. It is often detected before birth during routine prenatal ultrasound or in early infancy when imaging is done for other reasons. In many cases, this form of megaureter does not cause symptoms and is discovered incidentally. When symptoms do occur, they may include urinary tract infections, mild flank or abdominal discomfort, or occasionally blood in the urine. Because there is no true obstruction or reflux, the kidney usually functions normally, and the condition often improves on its own as the child grows. The treatment approach is generally conservative, meaning doctors prefer to watch and wait rather than operate. Regular monitoring with ultrasound and kidney function tests is the standard of care. Surgery is rarely needed and is typically reserved for cases where complications such as recurrent infections or declining kidney function develop. The long-term outlook for most children with this condition is very good, with many experiencing spontaneous resolution of the ureteral dilation during the first few years of life.
Key symptoms:
Widened ureter seen on ultrasoundUrinary tract infectionsMild flank or side painAbdominal discomfortBlood in the urineSwelling of the kidney (hydronephrosis) on imagingFever related to urinary infectionsNo symptoms at all (found incidentally on prenatal ultrasound)
Sporadic
Usually appears on its own, not inherited from a parent
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Congenital primary megaureter, nonrefluxing and unobstructed form.
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Specialists
View all specialists →No specialists are currently listed for Congenital primary megaureter, nonrefluxing and unobstructed form.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Congenital primary megaureter, nonrefluxing and unobstructed form.
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Caregiver Resources
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Questions for your doctor
Bring these to your next appointment
- Q1.Is my child's kidney function currently normal, and how will you monitor it over time?,Does my child need preventive antibiotics to reduce the risk of urinary tract infections?,How often will my child need ultrasound or other imaging follow-up?,What signs or symptoms should prompt me to seek urgent medical care?,What is the likelihood that the megaureter will resolve on its own without surgery?,Under what circumstances would surgery be recommended?,Are there any activity or dietary restrictions my child should follow?
Common questions about Congenital primary megaureter, nonrefluxing and unobstructed form
What is Congenital primary megaureter, nonrefluxing and unobstructed form?
Congenital primary megaureter, nonrefluxing and unobstructed form, is a rare condition present from birth in which one or both ureters (the tubes that carry urine from the kidneys to the bladder) are abnormally wide (dilated), but without any physical blockage or backward flow of urine (reflux). This condition is sometimes called idiopathic or functional megaureter because the exact cause of the dilation is not fully understood. It is often detected before birth during routine prenatal ultrasound or in early infancy when imaging is done for other reasons. In many cases, this form of megaurete
How is Congenital primary megaureter, nonrefluxing and unobstructed form inherited?
Congenital primary megaureter, nonrefluxing and unobstructed form follows a sporadic inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Congenital primary megaureter, nonrefluxing and unobstructed form typically begin?
Typical onset of Congenital primary megaureter, nonrefluxing and unobstructed form is neonatal. Age of onset can vary across affected individuals.