Figure 1. An inflammation of the mucosa with massive presence of plasma cells and granulocytes in the connective tissue was found in the samples taken from above the necrotic bone (A). (B) A conservation of the connective tissue isto-architecture and of deeper epithelial layers was found on the samples of the mucosa surrounding the osteonecrosis. The inflammatory infiltrate is poorly represented and small areas of cellular plasma densification are rarely noticeable. Despite the mucosa deep layers keep their original architecture, the superficial ones are characterized by the presence of swollen and hypereosinophilic cells with a picnotic nucleus, which represents the signs of pathognomonic cell suffering.