| The patient presented with peripheral lymphocytosis. The immunological profolie was typical of CLL with positivity for CD5, CD19 and CD23. | There are some signs of immaturity of the lymphatic cells. | Granulocytes are present in the peripheral blood. |
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| The normocellular marrow shows heavy infiltration by low grade lymphoma. | | Some signs of immaturity are present in the marrow as in the peripheral blood. |
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| In addition to the lymphcytes some blasts can be found. | |
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| Another blast looking myeloic. Is the small cytoplasmic piece an Auer rod. | The question arises whether the blasts are part of the lymphatic neoplasia. This blast shows an clearly recognizable Auer rod and proves the myeloic nature of this cell. | Another blast with another Auer rod. |
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| Peroxidase staining demonstrates the myeloic nature of the blasts and stains the Auer rods. | Two Auer rods in this myeloic blast. | AML showing 5q-minus. Few 5q-minus-megakaryocytes could be found. |
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