A 52-year-old man from Delhi presents to the emergency department with severe headache, confusion, and visual disturbances for 2 days. He has a history of chronic myeloid leukemia diagnosed 5 years ago, currently on imatinib therapy. Vital signs show blood pressure 160/100 mmHg and heart rate 110/min. Laboratory investigations reveal WBC 450,000/μL, hemoglobin 9.5 g/dL, and platelet count 850,000/μL. Peripheral blood smear shows numerous myelocytes, metamyelocytes, and occasional blasts with Auer rods. Retinal examination shows flame-shaped hemorrhages and cotton-wool spots. What is the most likely diagnosis?