Which statement best describes the relationship between small intestinal lymphoma and inflammatory bowel disease in cats?

Which statement best describes the relationship between small intestinal lymphoma and inflammatory bowel disease in cats?

• A. They are unrelated conditions
• B. IBD never mimics lymphoma
• C. Lymphoplasmacytic inflammatory bowel disease
• D. Lymphoplasmacytic inflammatory bowel disease can resemble small T cell lymphoma

Answer: (D)

In cats, chronic intestinal inflammation and lymphoma often look very similar under the microscope. Lymphoplasmacytic inflammatory bowel disease shows a dense infiltrate of lymphocytes and plasma cells in the intestinal mucosa, and small T-cell lymphoma can produce a comparable infiltrative pattern. Because of this overlap, a lesion diagnosed as lymphoplasmacytic inflammatory bowel disease can resemble small T-cell lymphoma, which is why further testing—such as immunohistochemistry to identify T- versus B-cell lineage and molecular clonality studies to detect a clonal (neoplastic) lymphoid population—is often needed to distinguish between inflammatory and neoplastic processes. This relationship highlights the diagnostic challenge and the need for additional work-up when the histology is ambiguous.

In cats, chronic intestinal inflammation and lymphoma often look very similar under the microscope. Lymphoplasmacytic inflammatory bowel disease shows a dense infiltrate of lymphocytes and plasma cells in the intestinal mucosa, and small T-cell lymphoma can produce a comparable infiltrative pattern. Because of this overlap, a lesion diagnosed as lymphoplasmacytic inflammatory bowel disease can resemble small T-cell lymphoma, which is why further testing—such as immunohistochemistry to identify T- versus B-cell lineage and molecular clonality studies to detect a clonal (neoplastic) lymphoid population—is often needed to distinguish between inflammatory and neoplastic processes. This relationship highlights the diagnostic challenge and the need for additional work-up when the histology is ambiguous.