HistiocytesLymphohistiocytosis, HemophagocyticHistiocytosis, Non-Langerhans-CellMacrophage Activation SyndromeSea-Blue Histiocyte SyndromeCytophagocytosisBone Marrow ExaminationFatal OutcomeHistiocytosisBone MarrowPhagocytosisCell ProliferationHistiocytosis, SinusHistiocytic SarcomaHistiocytosis, Langerhans-CellHistiocytic Disorders, MalignantErdheim-Chester DiseaseLymphatic DiseasesGranuloma, Plasma CellHistiocytoma, Benign FibrousLymph NodesGranulomaImmunohistochemistryPanniculitisEpithelioid CellsMalacoplakiaXanthomatosisLymphadenitisMycobacterium scrofulaceumCells, CulturedHistiocytic Necrotizing LymphadenitisImmunoenzyme TechniquesBiopsySignal TransductionCell DivisionLymphomaHodgkin DiseaseApoptosisCell DifferentiationHistocytochemistryCell Line, Tumor