A 41-day-old infant who had severe metabolic acidosis, anemia, bleedin
g, hypoglycemia, and proximal tubulopathy was diagnosed with Pearson s
yndrome. Fibrosis in the liver, severe iron deposition in hepatocytes,
and multiple renal cortical cysts were found on postmortem examinatio
n. Southern blot analysis of mitochondrial DNA obtained from periphera
l blood revealed a heteroplasmic deletion of approximately 3.5 kilobas
es.