At physical examination, his weight was 5800 g (<3rd percentile), his height was 68 cm (<75th percentile), and his head circumference was 42 cm(<10th percentile). He was dehydrated and his abdomen was severely distended but there was no organomegaly. Results of laboratory investigations were compatible with metabolic acidosis and mild hypokalemia. A complete blood cell count showed hemoglobin to be 11.4 g/dL; hematocrit, 35.3%; mean corpuscular volume, 71.9 fL; white blood cell count, 9.2 × 103/µL (9.2 × 109/L); and platelets, 220 × 103/µL (220 × 109/L). A peripheral blood smear revealed 36% granulocytes, 52% lymphocytes, 10% monocytes, 2% bands, and generalized acanthocytosis was noticed, involving more than 80% of erythrocytes (Figure 1).