Chapter 8 The lymphorecticular system and bone marrow/Fig 8.35.jpg

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Leucoerythroblastic blood film: a nucleated red blood cell precursor (short arrow) and an immature granulocyte (long arrow) are present. Immature precursors are not normally seen in the peripheral blood but, when present, indicate replacement of the normal marrow and consequent extramedullary haemopoiesis. Tear-drop poikilocytes are also a feature.