On the peripheral blood film, there was a moderate degree of red cell fragmentation (panel A) with ovalocytes, teardrop cells, and a near absence of neutrophils and platelets. A bone marrow aspirate (panel B) and biopsy were obtained. The incidence of myeloblasts was 5% by both morphologic and flow cytometric evaluation. Morphologic examination of the aspirate demonstrated marked dyserythropoie...