When an EGD (esophagogastroduodenoscopy)
biopsy shows pathology concerning for B-cell involvement,
it usually means the pathologist saw abnormal lymphoid cells in the tissue that may be related to a
B-cell lymphoma, which is a type of blood cancer that starts in B lymphocytes, a kind of white blood cell.
Here’s why this might happen:
1. Lymphoid Infiltrate in the GI Tract
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The stomach and intestines have lymphoid tissue as part of the immune system.
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Sometimes, B-cells grow abnormally in the lining of the GI tract, forming masses or ulcers.
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If these cells look clonal (all the same) or atypical, it raises concern for lymphoma.
2. Most Common: MALT Lymphoma
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A common type of B-cell lymphoma in the stomach is MALT (mucosa-associated lymphoid tissue) lymphoma.
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Often associated with H. pylori infection.
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Chronic infection stimulates B-cells to grow uncontrollably.
3. What Pathologists Look For
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Immunohistochemistry (IHC) tests: show markers like CD20, which is on B-cells.
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Light chain restriction: too many kappa or lambda chains suggest clonal B-cell growth.
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Cell appearance: large, irregular B-cells may indicate high-grade lymphoma.
4. Why It Matters
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B-cell involvement may mean the patient has a form of gastrointestinal lymphoma, needing further tests like CT scan, bone marrow biopsy, or PET scan.
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Early detection is important because some types (like MALT) respond well to antibiotics or immunotherapy.