Bland Urine Sediment in a Child with Acute Kidney Injury

Area of Science:

• Nephrology
• Pediatric Nephrology
• Pharmacology

Background:

• Acute interstitial nephritis (AIN) is an inflammatory renal condition affecting tubules and interstitium.
• Drug-induced AIN constitutes a significant portion of cases, with antibiotics, particularly beta-lactams, being common culprits.
• Cephalosporins are infrequently associated with AIN, especially in pediatric populations.

Observation:

• This report details a pediatric case of ceftriaxone-induced AIN.
• A key diagnostic challenge was the presence of bland urine sediment upon initial presentation.
• Renal biopsy is the gold standard for AIN diagnosis, though urinalysis typically offers diagnostic clues.

Findings:

• Ceftriaxone, a third-generation cephalosporin, was identified as the causative agent for AIN in this child.
• The absence of typical urinary findings (WBCs, WBC casts, RBCs) complicated the early diagnosis.
• This represents the first reported instance of ceftriaxone-induced AIN in a pediatric patient.

Implications:

• Highlights the potential for cephalosporins, including ceftriaxone, to cause AIN in children.
• Emphasizes that a normal urinalysis does not exclude AIN, necessitating a high index of suspicion in relevant clinical contexts.
• Underscores the importance of considering drug-induced AIN even with atypical presentations in pediatric patients.