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Primary extranodal lymphomas, definition
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The presenting lesion is extranodal
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The extranodal lesion constitutes the predominant disease bulk
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Although Waldeyer’s ring, thymus, and Peyer patches are excluded
from the original Ann Arbor classification of extra-nodal disease,
lymphomas in these sites are usually included
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Only meaningful for stage I-II disease (CS IE and IIE)
•
Extranodal involvement as part of disseminated lymphoma is not
included