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The simultaneous presentation of peripheral T‐cell lymphoma and hairy cell leukemia

A patient who presented simultaneously with B hairy cell leukemia (HCL) and peripheral T‐cell lymphoma (PTL) is described. The diagnoses of the two neoplasms were made by standard morphologic and cytochemical study and confirmed immunologically. There was no evidence of overlap in markers to suggest that they arose from a single clone of malignant cells. It is suggested that the simultaneous occurrence of the two neoplasms in the same patient reflects an underlying predisposition to the development of neoplasia in HCL.