A previously healthy 35-year-old man presented with 1 week of fatigue, abdominal discomfort, petechiae, and 1 day of dark urine (Figure 1A1). Laboratory investigations revealed severe thrombocytopenia (platelet count 2 normal 150 to 400 × 109/L), mild anemia (hemoglobin 120 [normal 135 to 170
Bhangu et al. (Sun,) studied this question.