Angioimmunoblastic T-cell lymphoma overview: Difference between revisions
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==Overview== | ==Overview== | ||
'''Angioimmunoblastic T-cell lymphoma (AILT)''' is a mature [[T-cell]] [[lymphoma]] characterized by a polymorphous [[lymph node]] infiltrate showing a marked increase in [[follicular dendritic cells]] (FDCs) and [[high endothelial venules]] (HEVs) and systemic involvement.<ref name="who1"/> It is also known as '''immunoblastic lymphadenopathy''' (Lukes-Collins Classification) and '''AILD-type (lymphogranulomatosis X) T-cell lymphoma''' (Kiel Classification)<ref name="who1">[http://www.iarc.fr/WHO-BlueBooks/BBwebsite/bb3.html] Jaffe E.S., Harris N.L., Stein H., Vardiman J.W. (eds): '''World Health Organization Classification of Tumors. Pathology and Genetics of Tumours of Haemopoietic and Lymphoid Tissues.''' IARC Press: Lyon 2001 </ref>. | '''Angioimmunoblastic T-cell lymphoma (AILT)''' is a mature [[T-cell]] [[lymphoma]] characterized by a polymorphous [[lymph node]] infiltrate showing a marked increase in [[follicular dendritic cells]] (FDCs) and [[high endothelial venules]] (HEVs) and systemic involvement.<ref name="who1"/> It is also known as '''immunoblastic lymphadenopathy''' (Lukes-Collins Classification) and '''AILD-type (lymphogranulomatosis X) T-cell lymphoma''' (Kiel Classification)<ref name="who1">[http://www.iarc.fr/WHO-BlueBooks/BBwebsite/bb3.html] Jaffe E.S., Harris N.L., Stein H., Vardiman J.W. (eds): '''World Health Organization Classification of Tumors. Pathology and Genetics of Tumours of Haemopoietic and Lymphoid Tissues.''' IARC Press: Lyon 2001 </ref>. Clonal [[T-cell receptor]] and [[immunoglobulin]] gene rearrangements are involved in the pathogenesis of angioimmunoblastic T-cell lymphoma. On gross pathology, polymorphous infiltrate, residual follicles, and blast-like [[B-cells]] are characteristic findings of angioimmunoblastic T-cell lymphoma. On microscopic histopathological analysis, [[CD4]]+ [[T-cells]], [[CD8]]+ [[T-cells]], and polyclonal [[plasma cells]] are characteristic findings of angioimmunoblastic T-cell lymphoma. There are no established causes for angioimmunoblastic T-cell lymphoma. Angioimmunoblastic T-cell lymphoma must be differentiated from other diseases such as peripheral T-cell lymphoma-not otherwise specified, [[classical Hodgkin's lymphoma]], [[diffuse large B cell lymphoma]] and [[nodal marginal zone lymphoma]]. | ||
==Pathophysiology== | |||
Clonal [[T-cell receptor]] and [[immunoglobulin]] gene rearrangements are involved in the pathogenesis of angioimmunoblastic T-cell lymphoma. On gross pathology, polymorphous infiltrate, residual follicles, and blast-like [[B-cells]] are characteristic findings of angioimmunoblastic T-cell lymphoma. On microscopic histopathological analysis, [[CD4]]+ [[T-cells]], [[CD8]]+ [[T-cells]], and polyclonal [[plasma cells]] are characteristic findings of angioimmunoblastic T-cell lymphoma. | |||
==Causes== | |||
There are no established causes for angioimmunoblastic T-cell lymphoma. | |||
==Differential Diagnosis== | |||
Angioimmunoblastic T-cell lymphoma must be differentiated from other diseases such as peripheral T-cell lymphoma-not otherwise specified, [[classical Hodgkin's lymphoma]], [[diffuse large B cell lymphoma]] and [[nodal marginal zone lymphoma]]. | |||
==Diagnosis== | ==Diagnosis== | ||
===Staging=== | ===Staging=== | ||
Revision as of 19:12, 21 December 2015
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Angioimmunoblastic T-cell lymphoma Microchapters |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [2]; Associate Editor(s)-in-Chief: Raviteja Guddeti, M.B.B.S. [3]
Overview
Angioimmunoblastic T-cell lymphoma (AILT) is a mature T-cell lymphoma characterized by a polymorphous lymph node infiltrate showing a marked increase in follicular dendritic cells (FDCs) and high endothelial venules (HEVs) and systemic involvement.[1] It is also known as immunoblastic lymphadenopathy (Lukes-Collins Classification) and AILD-type (lymphogranulomatosis X) T-cell lymphoma (Kiel Classification)[1]. Clonal T-cell receptor and immunoglobulin gene rearrangements are involved in the pathogenesis of angioimmunoblastic T-cell lymphoma. On gross pathology, polymorphous infiltrate, residual follicles, and blast-like B-cells are characteristic findings of angioimmunoblastic T-cell lymphoma. On microscopic histopathological analysis, CD4+ T-cells, CD8+ T-cells, and polyclonal plasma cells are characteristic findings of angioimmunoblastic T-cell lymphoma. There are no established causes for angioimmunoblastic T-cell lymphoma. Angioimmunoblastic T-cell lymphoma must be differentiated from other diseases such as peripheral T-cell lymphoma-not otherwise specified, classical Hodgkin's lymphoma, diffuse large B cell lymphoma and nodal marginal zone lymphoma.
Pathophysiology
Clonal T-cell receptor and immunoglobulin gene rearrangements are involved in the pathogenesis of angioimmunoblastic T-cell lymphoma. On gross pathology, polymorphous infiltrate, residual follicles, and blast-like B-cells are characteristic findings of angioimmunoblastic T-cell lymphoma. On microscopic histopathological analysis, CD4+ T-cells, CD8+ T-cells, and polyclonal plasma cells are characteristic findings of angioimmunoblastic T-cell lymphoma.
Causes
There are no established causes for angioimmunoblastic T-cell lymphoma.
Differential Diagnosis
Angioimmunoblastic T-cell lymphoma must be differentiated from other diseases such as peripheral T-cell lymphoma-not otherwise specified, classical Hodgkin's lymphoma, diffuse large B cell lymphoma and nodal marginal zone lymphoma.
Diagnosis
Staging
According to the Lugano classification, there are four stages of angioimmunoblastic T-cell lymphoma based on the number of nodes and extranodal involvement.
Symptoms
The most common symptoms of angioimmunoblastic T-cell lymphoma include fever, weight loss, skin rash, night sweats, edema, joint pain, chest pain, abdominal pain, bone pain and painless swelling in the neck, axilla, groin, thorax, and abdomen.
Physical Examination
Common physical examination findings of angioimmunoblastic T-cell lymphoma include fever, rash, ulcer, splenomegaly, hepatomegaly, pleural effusion, ascites, chest tenderness, abdomen tenderness, bone tenderness, arthritis, peripheral lymphadenopathy, and central lymphadenopathy.
Laboratory Tests
Laboratory tests for angioimmunoblastic T-cell lymphoma include complete blood count (CBC), polyclonal hypergammaglobulinemia, FISH, blood chemistry studies, flow cytometry, immunohistochemistry, and immunophenotyping.
CT
Abdominal CT scan may be helpful in the diagnosis of angioimmunoblastic T-cell lymphoma. Findings on CT scan suggestive of angioimmunoblastic T-cell lymphoma include mediastinal lymphadenopathy, inguinal lymphadenopathy, aortal lymphadenopathy, and bilaterally enlarged kidneys.
MRI
MRI scan may be helpful in the diagnosis of angioimmunoblastic T-cell lymphoma.
Biopsy
Lymph node or extranodal tissue biopsy is diagnostic of angioimmunoblastic T-cell lymphoma.
Ultrasound
Abdomen ultrasound may be helpful in the diagnosis of angioimmunoblastic T-cell lymphoma. Findings on ultrasound abdomen suggestive of angioimmunoblastic T-cell lymphoma include hepatomegaly and splenomegaly.
Other Imaging Studies
Positron emission tomographic CT scan may be helpful in the diagnosis of angioimmunoblastic T-cell lymphoma. Findings on positron emission tomographic CT scan suggestive of angioimmunoblastic T-cell lymphoma include lymphadenopathy and bilaterally enlarged kidneys.
Other Diagnostic Studies
Other diagnostic studies for angioimmunoblastic T-cell lymphoma include laparoscopy, laparotomy, bone marrow aspiration, and bone marrow biopsy.
Treatment
Medical Therapy
The predominant therapy for angioimmunoblastic T-cell lymphoma is chemotherapy. Adjunctive stem cell transplantation may be required.
References