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In situ follicular lymphoma is an accumulation of monoclonal B cells (i.e. cells descendent from a single ancestral cell) in the germinal centers of lymphoid tissue. These cells commonly bear a pathological genomic abnormality, i.e. a translocation between position 32 on the long (i.e. "q") arm of chromosome 14 and position 21 on chromosome 18's q arm.
Spread from the skin is unusual, and the prognosis is excellent [2]: 218 with a 5-year survival of over 97%. [2]: 314 The International Extranodal Lymphoma Study Group identified elevated LDH, more than two skin lesions, and nodular lesions as three prognostic factors, that are used to assess a cutaneous lymphoma international prognostic index (CLIPI), which is prognostic of disease-free status.
Given the success of the IPI for intermediate grade lymphomas, an effort was undertaken to develop a similar prognostic index for the most common low-grade lymphoma, follicular lymphoma. The prognostic factors that emerged from this were: age, stage, number of lymph node areas involved, serum hemoglobin level, and serum LDH. [3]
M9690/3 Follicular lymphoma, NOS (see also M9675/3) Malignant lymphoma, follicular/follicle center, NOS; M9691/3 Follicular lymphoma, grade 2 Follicular lymphoma, small cleaved cell; M9698/3 Follicular lymphoma, grade 3 Malignant lymphoma, large cell/centroblastic, follicular, NOS; M9699/3 Marginal zone B-cell lymphoma, NOS Marginal zone ...
Duodenal-type follicular lymphoma (DFL) is a form of lymphoma in which certain lymphocyte types, the B-cell-derived centrocytes and centroblasts, form lymph node follicle-like structures principally in the duodenum and other parts of the small intestine.
When used to uniquely identify a type of lymphoma, they are usually categorized as follicular or diffuse . The "small cleaved cells" are usually centrocytes that express B-cell markers such as CD20. The disease is strongly correlated with the genetic translocation t(14;18), which results in juxtaposition of the bcl-2 proto-oncogene with the ...
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