FIG 2. Summary of the clinical history of the patient. Plots show the MR imaging dates, with the percentage of fetal hemoglobin (Hb F), hemoglobin (Hgb), white blood cell (WBC) count, reticulocyte count, mean corpuscular volume (MCV), and platelet count after the initiation hydroxyurea treatment at time 0. HU indicates hydroxyurea.