phaidra.vetmeduni.ac.at o:3992 DOI 10.1177/03009858241281911 Feline eosinophilic sclerosing fibroplasia associated with T-/natural killer-cell lymphoma Feline eosinophilic sclerosing fibroplasia (FESF) is a proliferative, inflammatory disease of the gastrointestinal tract and other sites, uncommonly diagnosed in the cat. This entity of uncertain etiology typically presents as a progressive mass lesion, mimicking a neoplastic process. In this case series, we present 17 cases of FESF associated with intralesional lymphoma. Histologic and immunohistochemical characterization of this unique lymphoma revealed that the neoplastic lymphocytes were immunopositive for CD56 and/ or CD3, suggesting a natural killer cell, natural killer T-cell, or T-cell origin. This case series represents the first description of this lymphoma subtype, for which the term eosinophilic sclerosing lymphoma is proposed. eng Cats Animals Cat Diseases Pathology Cat Diseases Diagnosis Male Female Lymphoma, T-Cell Veterinary Lymphoma, T-Cell Pathology Lymphoma, T-Cell Diagnosis Immunohistochemistry Veterinary Killer Cells, Natural Pathology Eosinophils Pathology 2025-04-01T08:19:22.104Z LOMv1.0 Author BEGIN:VCARD VERSION:3.0 N:Klang;Andrea; FN:Andrea Klang X-ORCID:https://orcid.org/0000-0001-5352-5757 END:VCARD BEGIN:VCARD VERSION:3.0 N:Bertram;Christof A.; FN:Christof A. Bertram X-ORCID:https://orcid.org/0000-0002-2402-9997 END:VCARD BEGIN:VCARD VERSION:3.0 N:Donovan;Taryn A.; FN:Taryn A. Donovan X-ORCID:https://orcid.org/0000-0001-5740-9550 END:VCARD BEGIN:VCARD VERSION:3.0 N:Craig;Linden E.; FN:Linden E. Craig X-ORCID:https://orcid.org/0000-0003-0013-7544 END:VCARD BEGIN:VCARD VERSION:3.0 N:Walter;Ingrid; FN:Ingrid Walter X-ORCID:https://orcid.org/0000-0002-5038-188X END:VCARD BEGIN:VCARD VERSION:3.0 N:Wolfesberger;Birgitt; FN:Birgitt Wolfesberger X-ORCID:https://orcid.org/0000-0002-9536-5832 END:VCARD BEGIN:VCARD VERSION:3.0 N:Degasperi;Brigitte; FN:Brigitte Degasperi X-ORCID:https://orcid.org/0009-0001-0559-3728 END:VCARD BEGIN:VCARD VERSION:3.0 N:Baszler;Elisabeth; FN:Elisabeth Baszler END:VCARD BEGIN:VCARD VERSION:3.0 N:Rütgen;Barbara C.; FN:Barbara C. Rütgen X-ORCID:https://orcid.org/0000-0001-9080-0164 END:VCARD BEGIN:VCARD VERSION:3.0 N:Hammer;Sabine E.; FN:Sabine E. Hammer X-ORCID:https://orcid.org/0000-0003-1475-3938 END:VCARD BEGIN:VCARD VERSION:3.0 N:Fuchs-Baumgartinger;Andrea; FN:Andrea Fuchs-Baumgartinger END:VCARD https://w3id.org/kim/hcrt/scheme https://w3id.org/kim/hcrt/text Textdokument Text LOMv1.0 yes https://creativecommons.org/licenses/by/4.0 application/pdf 2366478 https://phaidra.vetmeduni.ac.at/o:3992 https://phaidra.vetmeduni.ac.at/api/object/o:3992/thumbnail LOMv1.0 discipline