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Hyperechoic renal papillae as a physiological finding in neonates
1Department of Clinical Pathology, Jichi Medical School, Tochigi, Japan.
Clinical Radiology
|April 21, 1999
Summary
Hyperechoic papillae, a transient finding in 13% of neonates, are linked to reduced urine volume and likely indicate renal tubule maturation. This echogenicity typically resolves within one week of birth.
Area of Science:
- Neonatal imaging
- Pediatric nephrology
- Fetal development
Background:
- The increased echogenicity of medullary pyramids in neonates and children is not well understood.
- This phenomenon requires further investigation through prospective studies.
Purpose of the Study:
- To prospectively investigate the kidneys of neonates and fetuses using ultrasound.
- To understand the underlying causes and implications of medullary pyramid echogenicity in early life.
Main Methods:
- Prospective ultrasound examination of fetal and neonatal kidneys.
- Analysis of kidney ultrasound images from fetuses in late pregnancy and neonates.
Main Results:
- Thirteen percent of neonates exhibited hyperechogenicity in the renal papillae, which resolved spontaneously within one week.
- No hyperechoic papillae were observed in any fetuses.
- Neonates with hyperechogenicity had significantly lower urine volumes compared to those without.
Conclusions:
- The absence of hyperechoic findings before 34 weeks gestation suggests renal tubule maturation and concentrating ability contribute to this observation.
- The term "hyperechoic papillae" is proposed as more accurate than "hyperechoic pyramids" due to the localized nature of the echogenicity.
- This transient finding in neonates may indicate specific maturational processes within the developing kidney.