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Osnabrück-Fall   
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Immunologic analysis of this case was done by a commercial lab.On the basis of positivity for CD5 and CD19 plus monoclonal light chain expression on the surface it was classified as CLL.Surface light chain expression was much too strong for CLL. CD23 for discrimation of mantle cell lymphoma was not done.
Immunologic analysis of this case was done by a commercial lab. (Position 1)On the basis of positivity for CD5 and CD19 plus monoclonal light chain expression on the surface it was classified as CLL. (Position 2)Surface light chain expression was much too strong for CLL. CD23 for discrimation of mantle cell lymphoma was not done. (Position 3)

CD10 for discrimination of FL was not done.CD20 was not done to test whether the cells are weakly positive as in CLL or strong as in other lymphomas.The leukemic cells do not resemble CLL cells.
CD10 for discrimination of FL was not done. (Position 4)CD20 was not done to test whether the cells are weakly positive as in CLL or strong as in other lymphomas. (Position 5)The leukemic cells do not resemble CLL cells. (Position 6)

The chromatin is not so condensed as in CLL.Many nuclei are indented.Possible diagnoses are: mantel cell lymphoma, marginal zone lymphoma, FL.
The chromatin is not so condensed as in CLL. (Position 7)Many nuclei are indented. (Position 8)Possible diagnoses are: mantel cell lymphoma, marginal zone lymphoma, FL. (Position 9)

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