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Updated: Jun 6, 2026
Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes
Published on: May 8, 2016
Diagnostic algorithm to differentiate lymphoma from inflammation in feline small intestinal biopsy samples
M Kiupel1, R C Smedley, C Pfent
1Department of Pathobiology and Diagnostic Investigation, Diagnostic Center for Population and Animal Health, Michigan State University, 4125 Beaumont Road, Lansing, MI 48910, USA. kiupel@dcpah.msu.edu
Insights
Diagnosing feline intestinal lymphoma versus inflammatory bowel disease (IBD) is challenging. Combining histology with immunophenotyping and PCR for lymphocyte clonality offers a more accurate diagnostic approach for cats.
Area of Science:
- Veterinary Pathology
- Comparative Oncology
- Gastroenterology
Background:
- Differentiating feline inflammatory bowel disease (IBD) from small intestinal lymphoma is diagnostically challenging using endoscopic biopsies.
- Accurate diagnosis is crucial for appropriate treatment and prognosis in cats with chronic gastrointestinal signs.
Purpose of the Study:
- To evaluate diagnostic methods for differentiating feline intestinal lymphoma from IBD.
- To identify key histomorphologic features distinguishing lymphoma from inflammation.
- To develop a stepwise diagnostic algorithm.
Main Methods:
- Retrospective study of 63 cats with chronic gastrointestinal signs.
- Evaluation of hematoxylin and eosin (HE)-stained sections, immunohistochemistry (IHC) for CD3e and CD79a, and PCR for lymphocyte clonality.
- Histomorphologic parameter analysis using Fisher's exact test and Bayesian statistics.
Main Results:
- Combining histology, immunophenotyping, and clonality analysis significantly improved diagnostic accuracy.
- Histologic features differentiating lymphoma included transmural infiltration, epitheliotropism, heterogeneity, and nuclear size.
- Sensitivity and specificity of diagnostic parameters were determined.
Conclusions:
- A stepwise algorithm combining histology, immunophenotyping, and PCR provides accurate differentiation of feline intestinal lymphoma and IBD.
- Key histologic features aid in distinguishing neoplastic from inflammatory lymphoid infiltrates.
- This approach enhances diagnostic confidence in challenging feline gastrointestinal cases.
Abstract:
Differentiating between inflammatory bowel disease (IBD) and small intestinal lymphoma in cats is often difficult, especially when only endoscopic biopsy specimens are available for evaluation. However, a correct diagnosis is imperative for proper treatment and prognosis. A retrospective study was performed using surgical and endoscopic intestinal biopsy specimens from 63 cats with a history of chronic diarrhea or vomiting or weight loss. A diagnosis of lymphoma or inflammation was based on microscopic examination of hematoxylin and eosin (HE)-stained sections alone, HE-stained sections plus results of immunohistochemical labeling (IHC) for CD3e and CD79a, and HE staining, immunophenotyping, and polymerase chain reaction (PCR) results for B and/or T cell clonality. In addition, various histomorphologic parameters were evaluated for significant differences between lymphoma and IBD using Fisher's exact test. The sensitivity and specificity of each parameter in the diagnosis of lymphoma were also determined. Results of Bayesian statistical analysis demonstrated that combining histologic evaluation of small intestinal biopsy specimens with immunophenotyping and analysis of clonality of lymphoid infiltrates results in more accurate differentiation of neoplastic versus inflammatory lymphocytes. Important histologic features that differentiated intestinal lymphoma from IBD included lymphoid infiltration of the intestinal wall beyond the mucosa, epitheliotropism (especially intraepithelial nests and plaques), heterogeneity, and nuclear size of lymphocytes. Based on the results of this study, a stepwise diagnostic algorithm that first uses histologic assessment, followed by immunophenotyping and then PCR to determine clonality of the lymphocytes, was developed to more accurately differentiate between intestinal lymphoma and IBD.
