The case of HNF-1beta mutation with medullary cysts

Area of Science:

• Nephrology
• Medical Genetics
• Pediatric Imaging

Background:

• Hepatocyte Nuclear Factor 1-beta (HNF-1beta) mutations are associated with various renal and urogenital anomalies.
• Prenatal diagnosis of kidney abnormalities relies heavily on ultrasound (US) imaging.
• Understanding the long-term evolution of these anomalies is crucial for patient management.

Observation:

• A female patient presented with hyperechoic fetal kidneys, suspected to be related to an HNF-1beta mutation.
• Postnatal follow-up revealed initial cortical and medullary cysts, with medullary cysts resolving over time.
• At 9 years, the patient exhibited persistent hyperechoic kidneys with only cortical cysts.

Findings:

• The study confirms the link between HNF-1beta mutation and cystic kidney changes.
• Ultrasound findings demonstrated a dynamic evolution of renal cysts from fetal to postnatal stages.
• The variability in US appearances underscores the importance of genetic confirmation.

Implications:

• This case highlights the spectrum of renal phenotypes associated with HNF-1beta mutations.
• Long-term follow-up is essential to track the natural history of HNF-1beta-associated kidney disease.
• Accurate prenatal diagnosis and genetic testing are vital for managing patients with suspected HNF-1beta-related kidney disease.