Transient Appearance Of Ring Sideroblasts In Peripheral Blood In The Acute Phase Of Secondary Hemolytic Anemia

![Figure][1] A 70-year-old woman presented with fatigue and splenomegaly. She had an 8-year history of polycythemia vera and had been diagnosed with secondary hemolytic anemia 2 years previously. Molecular analysis demonstrated a JAK2 V617F mutation. Laboratory testing revealed the following