Unicentric Castleman’s disease of the pancreas with massive central calcification

Figure 3 A: Germinal centers with hyalinized venules originating from a hypervascular mantle zone surrounded by small lymphocytes in a concentric onionskin pattern (hematoxylin and eosin); B: Areas of heterotopic calcification of the central part of the tumor (left panel) and hyaline deposits (right panel) (hematoxylin and eosin).