Fig. 2From: Successful treatment with daratumumab, lenalidomide, and dexamethasone therapy followed by autologous stem cell transplantation for newly diagnosed polyneuropathy, organomegaly, endocrinopathy, M-protein, skin changes syndrome: a case reportCervical lymph node histopathology; multicentric mixed-type Castleman disease. Regressed germinal centers and proliferation of high endothelial venules with hyalinization. CD138 and immunoglobulin λ-positive plasma cells are seen in the interfollicular zones. a, b Hematoxylin–eosin staining; c immunohistochemical staining for CD138; d immunohistochemical staining for immunoglobulin λBack to article page