[Simultaneous occurrence of pure red cell aplasia and malignant lymphoma (author's transl)].

A case report will be given about a patient, in whom a pure red cell aplasia preceded an IgM paraprotein-aemia and the clinical manifestations of a malignant B-cell lymphoma. The discussion deals with the question of a fortituous occurrence of two different diseases or of a common pathogenetic mechanism by which the PRCA could be considered as a paraneoplastic manifestation of an immunoproliferative disease.