[Castelman's angiofollicular hyperplasia of multifocal form Apropos of 2 cases]. / Hyperplasie angiofolliculaire de Castelman à forme multicentrique. A propos de deux observations.

Castelman described as angiofollicular hyperplasia (AFH) a benign lymphovascular hyperplasia forming a single tumour, classically situated in the mediastinum. A multifocal lymph node form of AFH was individualised by Leibetseder and Turner about 10 years ago (MAFH). This is a rare syndrome, the clinical and biological characteristics of which are almost identical to angioimmunoblastic lymphadenopathy (AIL). The only difference is in the histology of the ganglia which shows changes of AFH. We report two cases of MAFH. In one patient with histological confirmation of splenic involvement the evolution was subacute. In the second case, the histological features of the lesions were observed to change during successive biopsies: appearances of AFH changed to typical AIL. This observation suggests that MAFH may be a disorder of the immune system. Usually considered as benign lymphatic hyperplasia with a chronic evolution, the long-term development of lymphoma poses the problem of the evolutionary potential of this condition, which may be likened to AIL in which lymphomatous transformation is also recognised.