Acute interstitial nephritis in children: a report of 13 cases and review of the literature.

Clinical and pathologic data of 13 children, aged 5 to 16 years, with acute interstitial nephritis (AIN) are presented. The cause of AIN in these children was assessed as being related to infection in ten and methicillin in one; no infection, drug, or toxin could be implicated in two other patients. In addition to having various degrees of acute renal failure, all patients had systemic symptoms, most common of which were fatigue, fever, sore throat, and gastrointestinal disturbances. In six patients, the diagnosis of AIN was clinically suspected on the basis of tubular dysfunction such as low urinary specific gravity and glucosuria; in seven others the diagnosis was made after examination of the renal biopsy. Two patients had the nephrotic syndrome which resolved only after cytotoxic agents were added to corticosteroid therapy. The remaining 11 patients were given supportive therapy including peritoneal dialysis in one case. Complete recovery of renal function occurred in all patients within a mean interval of 69.5 +/- 34.7 days from the onset of symptoms, and all patients continue to have normal renal function during a follow-up period ranging from 1.5 to 10 years. We conclude that, in children, AIN is underdiagnosed, is most often associated with streptococcal infection, and carries an excellent prognosis.