HistiocytesSea-Blue Histiocyte SyndromeHistiocytosisHistiocytosis, Non-Langerhans-CellHistiocytosis, SinusHistiocytic SarcomaHistiocytosis, Langerhans-CellHistiocytic Disorders, MalignantErdheim-Chester DiseaseLymphatic DiseasesGranuloma, Plasma CellHistiocytoma, Benign FibrousGranulomaLymph NodesPanniculitisEpithelioid CellsLymphohistiocytosis, HemophagocyticMalacoplakiaXanthomatosisMycobacterium scrofulaceumLymphadenitisHistiocytic Necrotizing LymphadenitisBiopsyImmunoenzyme TechniquesHodgkin DiseaseLymphomaMononuclear Phagocyte SystemImmunohistochemistryHistocytochemistryRheumatoid Nodule