Lambda Light Chain Predominance as a Sign of Emerging Lymphoma

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Abstract
Immunohistologic methods can be used to help differentiate inflammatory from neoplastic lymphoid proliferations in extranodal sites. The majority of B-lymphocytes in an inflammatory process should show surface or cytoplasmic staining for kappa light chains, reflecting the normal human kappa:lambda ratio of approximately 2:1. If a benign-appearing lesion is found to contain predominantly lambda-positive cells, this may be a sign of an emerging lymphoma. The principle is illustrated by a case report of a lymphoid “pseudotumor” of the orbit that showed a polyclonal staining pattern with a predominance of lambda-positive cells and subsequently developed into a lymphoma-producing IgM lambda.

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