[Angioimmunoblastic lymphadenopathy. Case report with ultrastructural study (author's transl)].

Angioimmunoblastic lymphadenopathy is a rare clinical entity, first described in 1974, characterized by asthenia, anorexia, fever, sweating, generalized lymph node enlargement, hepatosplenomegaly, rash, hypergammaglobulinemia, and often Coomb's positive hemolytic anemia. Main histopathologic findings are lymphoplasmocytic and immunoblastic proliferations, increased vascular neshwork and interstitial granular PAS positive material deposits. A lymph node excised from a woman with angioimmunoblastic lymphadenopathy was examined under electron microscopy. Results of ultrastructural study are compared to the typical histologic pattern observed under light microscopy. Analysis of the cellularity and the significance of fibrous collagen found in the interstitial PAS positive material are commented on.