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The diagnostic relevance of mesenteric lymph node biopsy in small intestinal lymphoma in cats
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The diagnostic relevance of mesenteric lymph node biopsy in small intestinal lymphoma in cats
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Journal Article
The diagnostic relevance of mesenteric lymph node biopsy in small intestinal lymphoma in cats
2024
Overview
Abstract
Background
Regional lymph nodes are frequently sampled in cats with suspected intestinal lymphoma; however, their diagnostic value has not been explored.
Objectives
To investigate whether histologic and immunohistochemical analysis of mesenteric lymph nodes correlates with the diagnosis of intestinal lymphoma in cats.
Animals
One hundred 2 client-owned cats diagnosed with intestinal lymphoma.
Methods
Retrospective study. The inclusion criteria required a full-thickness biopsy of the small intestine and concurrent excision of mesenteric lymph nodes. Histologic and immunophenotypic analyses were performed on intestinal biopsies and corresponding lymph nodes. Selected nodal samples diagnosed with reactive lymph nodes underwent clonality testing.
Results
Transmural T-cell lymphomas, encompassing small and large cell types, were predominant (64 cases, 62.7%), with large B-cell lymphomas being more frequently transmural (68.8%) than mucosal (31.2%). Among all lymph nodes examined, 44 (43.1%; 95% CI: 33.9%-52.8%) exhibited neoplastic infiltration. Among cases of small cell lymphoma, 51 out of 72 (70.8%; 95% CI: 59.4%-80.1%) showed no nodal involvement. Clonality results correctly identified 19/30 (63.3%; 95% CI: 45.5%-78.2%) reactive lymph nodes. Concerns were raised regarding clonal identification in the remaining cases and potential misdiagnoses based on phenotypic characteristics.
Conclusion and Clinical Importance
The study underscores the potential drawbacks of relying solely on mesenteric lymph nodes for diagnosing intestinal lymphomas in cats, particularly small cell subtypes. It emphasizes the importance of full-thickness biopsies for assessing transmural infiltration and recommends caution when utilizing mesenteric lymph nodes for histologic, immunohistochemical and clonality evaluations in mucosal lymphomas. Despite limitations, this research highlights the need for comprehensive diagnostic strategies in cats with intestinal lymphoma.
Publisher
Oxford University Press,John Wiley & Sons, Inc,Wiley
Subject
/ Antigens
/ Biopsy
/ Blood
/ bowel
/ cat
/ Cats
/ excision
/ Female
/ Intestinal Neoplasms - diagnosis
/ Intestinal Neoplasms - pathology
/ Intestinal Neoplasms - veterinary
/ Intestine, Small - pathology
/ lymph
/ Lymphoma
/ Lymphoma, T-Cell - diagnosis
/ Lymphoma, T-Cell - pathology
/ Lymphoma, T-Cell - veterinary
/ Male
