Fig. 1From: Castleman disease of the hyaline vascular variant transforming to POEMS syndrome as endpoint: a case reportPathology of the biopsied lymph node showing features of Castleman disease of hyaline vascular variant. B-cell follicle with concentric layers of lymphocytes expanding to the mantel zone, known as “onion skin”, hyalinized germinal center with increased density of blood vessels. a original magnification× 100; b original magnification× 400Back to article page