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Overview of the WHO Hematopoietic Classification

Overview of the WHO Hematopoietic Classification

Microscopy Mechanics

Microscopy Mechanics

WHO Haematolymphoid, 5^th Edition Citation
Myeloid proliferations and neoplasms Myeloid precursor lesions Clonal Haematopoiesis Clonal haematopoiesis Clonal cytopenias of undetermined significance Myeloproliferative neoplasms Chronic myeloid leukaemia Chronic neutrophilic leukaemia Chronic eosinophilic leukaemia Polycythaemia vera Essential thrombocythaemia Primary myelofibrosis Juvenile myelomonocytic leukaemia Myeloproliferative neoplasm, NOS Mastocytosis Cutaneous mastocytosis Systemic mastocytosis Mast cell sarcoma Myelodysplastic neoplasms Myelodysplastic neoplasms, with defining genetic abnormalities MDS with low blasts and 5q deletion MDS with low blasts and SF3B1 mutation MDS with biallelic TP53 inactivation Myelodysplastic neoplasms, morphologically defined MDS with low blasts MDS, hypoplastic MDS with increased blasts Myelodysplastic neoplasms of childhood Childhood MDS with low blasts Childhood MDS with increased blasts Myelodysplastic/myeloproliferative neoplasms Chronic myelomonocytic leukaemia MDS/MPN with neutrophilia MDS/MPN with SF3B1 mutation and thrombocytosis MDS/MPN, NOS Acute myeloid leukaemia Acute myeloid leukaemia with defining genetic abnormalities Acute promyelocytic leukaemia with PML::RARA fusion AML with RUNX1::RUNX1T1 fusion AML with CBFB::MYH11 fusion AML with DEK::NUP214 fusion AML with RBM15::MRTFA fusion AML with BCR::ABL1 fusion AML with KMT2A rearrangement AML with MECOM rearrangement AML with NUP98 rearrangement AML with NPM1 mutation AML with CEBPA mutation AML, myelodysplasia-related AML with other defined genetic alterations Acute myeloid leukaemia, defined by differentiation AML with minimal differentiation AML without maturation AML with maturation Acute basophilic leukaemia Acute myelomonocytic leukaemia Acute monocytic leukaemia Acute erythroid leukaemia Acute megakaryoblastic leukaemia Myeloid sarcoma Myeloid sarcoma Myeloid neoplasms, secondary Myeloid neoplasms and proliferations associated with antecedent or predisposing conditions Myeloid neoplasm post cytotoxic therapy Myeloid neoplasms associated with germline predisposition Myeloid proliferations associated with Down syndrome Myeloid/lymphoid neoplasms Myeloid/lymphoid neoplasms with eosinophilia and defining gene rearrangement Myeloid/lymphoid neoplasm with PDGFRA rearrangement Myeloid/lymphoid neoplasm with PDGFRB rearrangement Myeloid/lymphoid neoplasm with FGFR1 rearrangement Myeloid/lymphoid neoplasm with JAK2 rearrangement Myeloid/lymphoid neoplasm with FLT3 rearrangement Myeloid/lymphoid neoplasm with ETV6::ABL1 fusion Myeloid/lymphoid neoplasms with other tyrosine kinase gene fusions Acute leukaemias of mixed or ambiguous lineage Acute leukaemia of ambiguous lineage with defining genetic abnormalities Mixed-phenotype acute leukaemia with BCR::ABL1 fusion Mixed-phenotype acute leukaemia with KMT2A rearrangement Acute leukaemia of ambiguous lineage with other defined genetic alterations Acute leukaemia of ambiguous lineage, immunophenotypically defined Mixed-phenotype acute leukaemia, B/myeloid Mixed-phenotype acute leukaemia, T/myeloid Mixed-phenotype acute leukaemia, rare types Acute leukaemia of ambiguous lineage, NOS Acute undifferentiated leukaemia Histiocytic/Dendritic cell neoplasms Plasmacytoid dendritic cell neoplasms Mature PDC proliferation associated with myeloid neoplasm Blastic plasmacytoid dendritic cell neoplasm Langerhans cell and other dendritic cell neoplasms Langerhans cells neoplasms Langerhans cell histiocytosis Langerhans cell sarcoma Other dendritic cell neoplasms Indeterminate dendritic cell tumour Interdigitating dendritic cell sarcoma Histiocyte/macrophage neoplasms Histiocytic neoplasms Juvenile xanthogranuloma Erdheim-Chester disease Rosai-Dorfman Disease ALK+ histiocytosis Histiocytic sarcoma	B-cell lymphoid proliferations and lymphomas Tumour like lesions with B-cell predominance Reactive B-cell rich lymphoid proliferations that can mimic lymphoma IgG4-related disease Unicentric Castleman disease Idiopathic multicentric Castleman disease KSHV/HHV8-associated multicentric Castleman disease Precursor B-cell neoplasms B-lymphoblastic leukaemias/lymphomas B-lymphoblastic leukaemia/lymphoma B-ALL with high hyperdiploidy B-ALL with hypodiploidy B-ALL with iAMP21 B-ALL with BCR::ABL1 fusion B-ALL with BCR::ABL1-like features B-ALL with KMT2A rearrangement B-ALL with ETV6::RUNX1 fusion B-ALL with ETV6::RUNX1-like features B-ALL with TCF3::PBX1 fusion B-ALL with IGH::IL3 fusion B-ALL with TCF3::HLF fusion B-ALL with other defined genetic alterations B-ALL, NOS Mature B-cell neoplasms Pre-neoplastic and neoplastic small lymphocytic proliferations Monoclonal B-cell lymphocytosis Chronic lymphocytic leukaemia/small lymphocytic lymphoma Splenic B-cell lymphomas and leukaemias Hairy cell leukaemia Splenic MZL Splenic diffuse red pulp small B-cell lymphoma Splenic B-cell lymphoma/leukaemia with prominent nucleoli Lymphoplasmacytic lymphoma Marginal zone lymphoma Extranodal MZL of mucosa-associated lymphoid tissue Primary cutaneous MZL Nodal MZL Paediatric nodal MZL Follicular lymphoma In situ follicular B-cell neoplasm Follicular lymphoma Paediatric-type follicular lymphoma Duodenal-type follicular lymphoma Cutaneous follicle centre lymphoma Primary cutaneous follicle centre lymphoma Mantle cell lymphoma In situ mantle cell neoplasm Mantle cell lymphoma Leukaemic non-nodal mantle cell lymphoma Transformations of indolent B-cell lymphomas Transformations of indolent B-cell lymphomas Large B-cell lymphomas Diffuse large B-cell lymphoma (DLBCL), NOS T-cell/histiocyte-rich large B-cell lymphoma (THRLBCL) DLBCL/HGBCL with MYC and BCL2 rearrangements ALK+ large B-cell lymphoma Large B-cell lymphoma with IRF4 rearrangement High grade B-cell lymphoma with 11q aberrations Lymphomatoid granulomatosis EBV+ diffuse large B-cell lymphoma Diffuse large B-cell lymphoma associated with chronic inflammation Fibrin-associated large B-cell lymphoma Fluid overload-associated large B-cell lymphoma Plasmablastic lymphoma Primary large B-cell lymphoma of immune-privileged sites Primary cutaneous diffuse large B-cell lymphoma, leg type Intravascular large B-cell lymphoma Primary mediastinal large B-cell lymphoma Mediastinal grey zone lymphoma High-grade B-cell lymphoma, NOS Burkitt lymphoma Burkitt lymphoma KSHV/HHV8-associated B-cell lymphoid proliferations and lymphomas Primary effusion lymphoma KSHV/HHV8+ diffuse large B-cell lymphoma KSHV/HHV8+ germinotropic LPD Lymphoid proliferations and lymphomas associated with immune deficiency and dysregulation Hyperplasias arising in immune deficiency/dysregulation Polymorphic LPD arising in immune deficiency/dysregulation EBV+ mucocutaneous ulcer Lymphomas arising in immune deficiency/dysregulation Inborn error of immunity-associated lymphoid proliferations and lymphomas Hodgkin lymphoma Classic Hodgkin lymphoma Nodular lymphocyte predominant Hodgkin lymphoma Plasma cell neoplasms and other diseases with paraproteins Monoclonal gammopathies Cold agglutinin disease IgM monoclonal gammopathy of undetermined significance Non-IgM monoclonal gammopathy of undetermined significance Monoclonal gammopathy of renal significance Diseases with monoclonal immunoglobulin deposition Immunoglobulin-related (AL) amyloidosis Monoclonal immunoglobulin deposition disease Heavy chain diseases Mu heavy chain disease Gamma heavy chain disease Alpha heavy chain disease Plasma cell neoplasms Plasmacytoma Plasma cell myeloma/multiple myeloma Plasma cell neoplasms with associated paraneoplastic syndrome	T-cell and NK-cell lymphoid proliferations and lymphomas Tumour-like lesions with T-cell predominance Kikuchi-Fujimoto disease Autoimmune lymphoproliferative syndrome (ALPS) Indolent T-lymphoblastic proliferation Precursor T-cell neoplasms T-lymphoblastic leukaemias/lymphomas T-lymphoblastic leukaemia/lymphoma, NOS Early T-precursor lymphoblastic leukaemia/lymphoma Mature T-cell and NK-cell neoplasms Mature T-cell and NK-cell leukaemias T-prolymphocytic leukaemia T-large granular lymphocytic leukaemia NK-large granular lymphocytic leukaemia Adult T-cell leukaemia/lymphoma Sezary syndrome Aggressive NK-cell leukaemia Primary cutaneous T-cell lymphoid proliferations and lymphomas Primary cutaneous CD4+ small or medium T-cell LPD Primary cutaneous acral CD8+ T-cell LPD Mycosis fungoides Primary cutaneous CD30+ T-cell LPD: Lymphomatoid papulosis Primary cutaneous CD30+ T-cell LPD: Primary cutaneous anaplastic large cell lymphoma Subcutaneous panniculitis-like T-cell lymphoma Primary cutaneous gamma/delta T-cell lymphoma Primary cutaneous CD8+ aggressive epidermotropic cytotoxic T-cell lymphoma Primary cutaneous peripheral T-cell lymphoma, NOS Intestinal T-cell and NK-cell lymphoid proliferations and lymphomas Indolent T-cell lymphoma of the gastrointestinal tract Indolent NK-cell LPD of the gastrointestinal tract Enteropathy-associated T-cell lymphoma (EATL) Monomorphic epitheliotropic intestinal T-cell lymphoma Intestinal T-cell lymphoma, NOS Hepatosplenic T-cell lymphoma (HSTCL) Hepatosplenic T-cell lymphoma Anaplastic large cell lymphoma (ALCL) ALK+ anaplastic large cell lymphoma ALK-negative anaplastic large cell lymphoma Breast implant-associated anaplastic large cell lymphoma Nodal T-follicular helper (TFH) cell lymphoma (NTFHL) Nodal TFH cell lymphoma, angioimmunoblastic-type (AITL) Nodal TFH cell lymphoma, follicular-type Nodal TFH cell lymphoma, NOS Other peripheral T-cell lymphomas Peripheral T-cell lymphoma, NOS (PTCL NOS) EBV+ NK-cell and T-cell lymphomas EBV+ nodal T- and NK-cell lymphoma Extranodal NK/T-cell lymphoma EBV+ T-cell and NK-cell lymphoid proliferations and lymphomas of childhood Severe mosquito bite allergy Hydroa vacciniforme LPD Systemic chronic active EBV disease Systemic EBV+ T-cell lymphoma of childhood Stroma-derived neoplasms of lymphoid tissues Mesenchymal dendritic cell neoplasms Follicular dendritic cell neoplasms Follicular dendritic cell sarcoma EBV+ inflammatory follicular dendritic cell sarcoma Fibroblastic reticular cell tumour Myofibroblastic tumours Myofibroblastic tumour Intranodal palisaded myofibroblastoma Spleen-specific vascular-stromal tumours Splenic vascular-stromal tumours Littoral cell angioma Splenic hamartoma Sclerosing angiomatoid nodular transformation (SANT) of spleen Genetic tumour syndromes Fanconi anaemia Bloom syndrome Ataxia-telangiectasia syndrome RASopathies