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[[Image:Acute leukemia-ALL.jpg | thumb|right|A bone marrow of an individual with precursor B-cell lymphoblastic leukemia. [[Wright stain]]. (WC)]] | [[Image:Acute leukemia-ALL.jpg | thumb|right|A bone marrow of an individual with precursor B-cell lymphoblastic leukemia. [[Wright stain]]. (WC)]] | ||
The | The term '''leukemia''' is broadly used to refer to any haematological malignancy where the neoplastic cells in the circulation are the prominent feature. It is generally only seen by anatomical pathologists only in countries where hematopathology reporting is done by anatomical pathologists rather than hematologists. | ||
Lymphoma is discussed in the ''[[lymphoma]]'' article, and overlaps somewhat with leukemia as the clear distinction between the two is historical | Lymphoma is discussed in the ''[[lymphoma]]'' article, and overlaps somewhat with leukemia as the clear distinction between the two is somewhat arbitrary and historical:<ref>{{Ref PCPBoD8|314}}</ref> | ||
*Leukemia = involves bone marrow +/- peripheral blood. | *Leukemia = involves bone marrow +/- peripheral blood. | ||
**Classic presentation: infection, bleeding, anemia. | **Classic presentation: infection, bleeding, anemia. | ||
*Lymphoma = discrete mass(es), usu. [[lymph node]]. | *Lymphoma = discrete mass(es), usu. [[lymph node]]. | ||
**Classic presentation: non-tender lymph nodes | **Classic presentation: non-tender lymph nodes | ||
Leukemias may present as discrete massess, e.g. in the skin ([[leukemia cutis]]) or at other sites, where it is known by various names ([[myeloid sarcoma]], chloroma, etc.). | |||
Most leukemias are typically classified into acute or chronic. As a general rule, the designation of '''acute''' signifies a more immature and aggressive phenotype, whilst '''[[chronic]]''' leukemias generally show a more differentiated phenotype and run a more indolent course. There are exceptions, of course, and some chronic leukemias may transform into acute lymphomas. | |||
=Definition= | =Definition= | ||
This varies with the type. | |||
For acute myeloid leukemia, all of the following:<ref name=dg21mar20011>D. Good. 21 March 2011.</ref> | |||
#Morphologic abnormalities. | #Morphologic abnormalities. | ||
#>20% blasts ''or'' recurrent cytogenetic abnormality. | #>20% blasts ''or'' recurrent cytogenetic abnormality. | ||
=Leukemia classification= | |||
*[[Acute myeloid leukemia]] (AML). In this context, myeloid is used broadly to refer to non-lymphoid precursors rather than the more limited meaning granulopoietic: | |||
*#AML. | |||
*#AML with recurrent cytogenetic abnormalities, e.g. t(8;21), inv(16) and t(15;17). | |||
*#AML arising from [[MDS]]. | |||
*#AML in the setting of [[Down syndrome]]. | |||
*[[Acute lymphoblastic leukemia]] (ALL): | |||
*#B cell. | |||
*#B cell with recurrent cytogenetic abnormalities. | |||
*#T cell (sometimes abbreviated to T-ALL) | |||
*T-ALL should not to be confused with [[adult T-cell leukemia/lymphoma]] (ATLL) - this is associated with HTLV-1 infection | |||
*[[Chronic lymphocytic leukemia]] (CLL) - usually classified with lymphomas | |||
A few fall under the umbrella of '''[[myeloproliferative neoplasm]]s''': | |||
*[[Chronic myeloid leukemia]] (CML) | |||
*[[Chronic neutrophilic leukemia]] (rare) | |||
*[[Chronic eosinophilic leukemia]] (rare) | |||
And others under the myeloproliferative/myelodysplastic overlap syndromes: | |||
*[[Chronic myelomonocytic leukemia]] | |||
Other less common leukemias: | |||
*Hairy cell leukemia | |||
*T-cell prolymphocytic leukemia | |||
*T-cell large granular lymphocyte leukaemia (T-LGL) | |||
*Plasma cell leukaemia | |||
*Mast cell leukemia | |||
=Histomorphologic overview= | =Histomorphologic overview= | ||
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† should be easy to remember as smALL people, i.e. kids, get this type of acute leukemia. | † should be easy to remember as smALL people, i.e. kids, get this type of acute leukemia. | ||
=Algorithms= | =Algorithms= | ||
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*Chemotherapy? | *Chemotherapy? | ||
*[[Down syndrome]]? | *[[Down syndrome]]? | ||
=Prognosis= | =Prognosis= | ||
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#lymphoid leukaemia: 52.4% (Colombia) to 91.6% (Germany) | #lymphoid leukaemia: 52.4% (Colombia) to 91.6% (Germany) | ||
#acute myleoid leukemia: 33.3% (Bulgaria) to 78.2% (Germany) | #acute myleoid leukemia: 33.3% (Bulgaria) to 78.2% (Germany) | ||
=See also= | =See also= |
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