What is an incorrect characteristic associated with nodal marginal zone lymphoma?

• A. Diffuse nodal disease presentation
• B. CD10 positivity
• C. Variable clinical characteristics
• D. Staining positive for CD20

Answer: (B)

Nodal marginal zone lymphoma is a subtype of B-cell non-Hodgkin lymphoma characterized by a specific clinical and immunophenotypic profile. The disorder typically presents with certain distinctive features, and understanding these can help clarify why some characteristics are not associated with this condition.

In nodal marginal zone lymphoma, a key marker is CD20, which is usually expressed. This marker plays a crucial role in B-cell activation and proliferation, so staining positive for CD20 aligns with the expected immunophenotype. The condition also often exhibits variable clinical characteristics, as the disease can manifest differently from one patient to another in terms of symptoms and progression.

However, when it comes to CD10 positivity, this marker is more commonly associated with other B-cell lymphomas, such as follicular lymphoma and some forms of diffuse large B-cell lymphoma. Nodal marginal zone lymphoma typically does not express CD10, which differentiates it from other lymphoproliferative disorders. Therefore, stating that nodal marginal zone lymphoma is CD10 positive is incorrect and highlights an important immunophenotypic distinction that is crucial for diagnosis and classification of B-cell neoplasms.

By understanding these characteristics, healthcare providers can better diagnose and manage patients with various forms of lymphoma, ensuring