Nephrology
A 9-mo-old male infant is noted to have failure to thrive. At birth, his height and weight were at the 25th percentile, but by 9 mo of age, height and weight are at less than the 5th percentile. Laboratory tests reveal a non-anion gap metabolic acidosis, with a serum potassium of 3.5 mmol/L. Serum creatinine is 0.3 mg/dL. Urinalysis shows a urine pH of 8.0, with noabnormalities. A diagnosis of distal renal tubular acidosis is made. Renal ultrasonography is most likely to show:
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