[Reactive lymph-node hyperplasia and pseudolymphomas with hypergammaglobulinemia. II. Pseudolymphoma and prelymphoma].

In this second part, the dysimmunitary conditions which associate a polyclonal hypergammapathy and adenopathy are studied. The latter simulate a malignant lymphoma both clinically and histologically, hence the term sometimes used: "pseudo-lymphoma". Above all, these dysimmunitary states should be considered as real pretumoral states, and a malignant lymphoma or Kaposi sarcoma can arise at any time during the evolution of the illness. Finally, all these illnesses, even apart from the appearance of malignant tumors, have a severe evolution and death can occur due to consequences of immune disorders and particularly to infection. The different histopathological and evolutive aspects of the following are successively studied: angio-immunoblastic lymphadenopathy; the association of adenopathy with Kaposi's sarcoma; the syndrome of epidemic immune deficiency of T cells (acquired immune deficiency syndrome; frequent in homosexuals; the Gougerot-Sjögren syndrome; adenopathy due to medicaments; and the lymphomatoid granulomatosis of Liebow. The similarity of the histopathological lymph node lesions observed in these different dysimmunitary states suggests an identical physiopathology. Also, the existence of frequent associations between these different diseases suggests a common triggering mechanism. The role of virus on a favourable hereditary ground is discussed.