It has long been believed that the coexistence of myelo- and lymphopoietic malignancies may develop as treatment-related complications. However, there are reports on the coincidence of lymphoid and non-lymphoid haemopoietic disorders, unrelated to therapy as well. Authors present 8 more examples for the concomitant development of myelodysplasia with multiple myeloma or monoclonal gammopathy. For such cases several explanations have been proposed that are also briefly reviewed.
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