[Nephrocalcinosis in children]

Area of Science:

• Pediatric Nephrology
• Renal Pathophysiology
• Mineral Metabolism

Background:

• Nephrocalcinosis is characterized by calcium deposits within kidney tissue, differing from urolithiasis (stones).
• Its epidemiology in children is not well-defined, though it appears more common in preterm infants.
• Radiologically, it presents as medullary, cortical, or diffuse patterns.

Purpose of the Study:

• To outline the definition, classification, and common etiologies of nephrocalcinosis in pediatric populations.
• To emphasize the importance of differentiating nephrocalcinosis from urolithiasis.
• To highlight the role of early diagnosis and etiological treatment in managing pediatric nephrocalcinosis.

Main Methods:

• Review of existing literature and clinical definitions of nephrocalcinosis.
• Classification based on radiological findings (medullary, cortical, diffuse).
• Analysis of common causes including hereditary, metabolic, and iatrogenic factors.

Main Results:

• Common causes in children include distal renal tubular acidosis, Dent disease, hypercalciuria, hyperoxaluria, and vitamin D intoxication.
• Hypercalciuria of the premature infant is a significant cause in newborns, often iatrogenic.
• Primary hyperoxaluria is a critical consideration for early-onset nephrocalcinosis and chronic kidney disease.

Conclusions:

• Accurate diagnosis requires integrating family history, clinical presentation, and laboratory data.
• Prompt etiological treatment can prevent or slow the progression to chronic kidney disease.
• Nephrocalcinosis management necessitates a comprehensive diagnostic and therapeutic approach in pediatric cases.