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Monge E, Garapin B, Lucas MN, Gaide N, Le Loc'h G, Donnelly TM, Delverdier M. Concurrent Mycobacterium genavense infection and intestinal B-cell lymphoma in a pet rabbit (Oryctolaguscuniculus). J Comp Pathol 2023; 204:1-6. [PMID: 37269779 DOI: 10.1016/j.jcpa.2023.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 01/19/2023] [Accepted: 04/25/2023] [Indexed: 06/05/2023]
Abstract
A 6-year-old male intact pet rabbit was evaluated for chronic weight loss. A large mass was detected by palpation in the mid-abdomen and ultrasound examination suggested a jejunal location. Explorative laparotomy revealed a nodular mass within the jejunal wall. Histological examination of a biopsy revealed mycobacterial granulomatous enteritis with an atypical lymphoblastic proliferation suggestive of lymphoma. Neoplastic lymphocytes were immunopositive for Pax-5 but negative for CD3, which is diagnostic of a B-cell neoplasm. Numerous acid-fast bacteria were seen within histiocytes and identified by polymerase chain reaction as Mycobacterium genavense, which is a non-tuberculous and opportunistic mycobacterium with zoonotic potential. To the best of our knowledge, this is the first documented case of a concurrent B-cell lymphoma and M. genavense infection in a rabbit. Concomitant mycobacteriosis and lymphoma have been rarely described in animals and the coexistence of neoplasia and mycobacterial infection within the jejunum suggests a potential pathogenetic association. Interestingly, the rabbit owner worked in an anti-tuberculosis clinic, and an anthropic origin of the mycobacterial infection could not be excluded.
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Affiliation(s)
- Emma Monge
- Zoological Medicine Department, Université de Toulouse, ENVT, Chemin de Capelles, Toulouse, 31076, Occitanie, France; IHAP, Université de Toulouse, INRAe, ENVT - Toulouse, 31076, Occitanie, France.
| | - Bénédicte Garapin
- IHAP, Université de Toulouse, INRAe, ENVT - Toulouse, 31076, Occitanie, France; Department of Basic Sciences, Université de Toulouse, ENVT Chemin de Capelles, Toulouse, 31076, Occitanie, France
| | - Marie-Noëlle Lucas
- Laboratoire d'Anatomie Pathologique Vétérinaire du Sud-Ouest, All. des Vitarelles, Toulouse, 31100, France
| | - Nicolas Gaide
- IHAP, Université de Toulouse, INRAe, ENVT - Toulouse, 31076, Occitanie, France; Department of Basic Sciences, Université de Toulouse, ENVT Chemin de Capelles, Toulouse, 31076, Occitanie, France
| | - Guillaume Le Loc'h
- Zoological Medicine Department, Université de Toulouse, ENVT, Chemin de Capelles, Toulouse, 31076, Occitanie, France; IHAP, Université de Toulouse, INRAe, ENVT - Toulouse, 31076, Occitanie, France
| | - Thomas M Donnelly
- Exotic Animal Service, CHUVA, École Nationale Vétérinaire d'Alfort, Av. du Général de Gaulle, Maisons-Alfort, 94700, France
| | - Maxence Delverdier
- Zoological Medicine Department, Université de Toulouse, ENVT, Chemin de Capelles, Toulouse, 31076, Occitanie, France; IHAP, Université de Toulouse, INRAe, ENVT - Toulouse, 31076, Occitanie, France
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Ohmi A, Tanaka M, Rinno J, Tsuboi M, Chambers JK, Uchida K, Goto-Koshino Y, Tomiyasu H, Ohno K, Tsujimoto H. Clinical characteristics and outcomes of Mott cell lymphoma in nine miniature dachshunds. Vet Med Sci 2023; 9:609-617. [PMID: 36401603 PMCID: PMC10029887 DOI: 10.1002/vms3.975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND Lymphoma with Mott cell change, or Mott cell lymphoma (MCL), is an uncommon variant of canine lymphoma. Because of its rare occurrence, there has been no comprehensive study describing the disease so far. Miniature dachshunds, a popular breed in Japan, sometimes experience MCL. OBJECTIVES To investigate the clinical characteristics and outcomes of MCL in miniature dachshunds. METHODS Medical records were retrospectively reviewed to identify miniature dachshunds diagnosed with MCL and other types of lymphoma. Data on clinical and laboratory findings, treatments and outcomes were collected. Survival times were compared between miniature dachshunds with MCL and other types of lymphoma. RESULTS Of the 87 miniature dachshunds diagnosed with lymphoma, 9 (10%) had cytological characteristics of MCL. All 9 miniature dachshunds with MCL were categorised as having alimentary lymphoma (small and/or large intestine, 6 dogs; mesenteric lymph node, 3 dogs). The median age was 3.1 years (range, 2.0-9.4 years). All nine dogs were treated with chemotherapeutic protocols used for large cell lymphoma or alkylating agents such as melphalan or chlorambucil. The overall response rate to initial chemotherapy was 78%, and the median progression-free survival was 105 days. Overall survival in these nine dogs ranged from 6 to >1513 days (median, 240 days), which was significantly longer than in 29 miniature dachshunds with alimentary large cell lymphoma other than MCL (median, 57 days; p = 0.0491). CONCLUSIONS MCL in miniature dachshunds can be recognised as a peculiar type of B-cell lymphoma occurring in relatively young dogs as an alimentary form and has a longer survival compared with typical alimentary large cell lymphoma.
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Affiliation(s)
- Aki Ohmi
- Veterinary Medical Center, The University of Tokyo, Tokyo, Japan
| | - Miho Tanaka
- Veterinary Medical Center, The University of Tokyo, Tokyo, Japan
| | - Jun Rinno
- Veterinary Medical Center, The University of Tokyo, Tokyo, Japan
| | - Masaya Tsuboi
- Veterinary Medical Center, The University of Tokyo, Tokyo, Japan
| | - James K Chambers
- Department of Veterinary Pathology, The University of Tokyo, Tokyo, Japan
| | - Kazuyuki Uchida
- Department of Veterinary Pathology, The University of Tokyo, Tokyo, Japan
| | | | - Hirotaka Tomiyasu
- Department of Veterinary Internal Medicine, The University of Tokyo, Tokyo, Japan
| | - Koichi Ohno
- Department of Veterinary Internal Medicine, The University of Tokyo, Tokyo, Japan
| | - Hajime Tsujimoto
- Department of Veterinary Internal Medicine, The University of Tokyo, Tokyo, Japan
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Concordance of the Histopathologic Diagnosis of Concurrent Duodenal and Ileal Biopsy Specimens in Dogs. Animals (Basel) 2021; 11:ani11102938. [PMID: 34679959 PMCID: PMC8532859 DOI: 10.3390/ani11102938] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 10/04/2021] [Accepted: 10/05/2021] [Indexed: 12/19/2022] Open
Abstract
Histopathologic discordance between gastrointestinal (GI) locations in canine chronic inflammatory enteropathy (CIE) has prompted recommendations to biopsy both the duodenum and ileum, while further evaluation is required for non-CIE. We aimed to determine the concordance of histopathologic diagnosis between duodenal and ileal endoscopic or full-thickness biopsy specimens for all dogs with CIE and GI neoplasia and to assess the association between histopathologic discordance between GI locations with clinicopathologic variables. Seventy-nine dogs were eligible, with endoscopic (74) or full-thickness (5) biopsy specimens. Clinicopathological data were recorded for all dogs. Concordance of histopathologic diagnosis was retrospectively assessed for concurrent duodenal and ileal biopsy specimens by a single board-certified veterinary pathologist using the modified World Small Animal Veterinary Association (WSAVA) Gastrointestinal Standardization Group guidelines. Sixty-seven dogs were diagnosed with CIE and 5 with enteric-associated T-cell lymphoma-2 (EATL-2). Concordance of histologic diagnosis between duodenal and ileal sites was similar between endoscopic (73.0%) and full-thickness (80.0%) biopsy groups. For the CIE cases, lymphoplasmacytic enteritis had the highest concordance (73.0%) and eosinophilic enteritis the least (16.7%). Of the 5 neoplastic cases, 5/5 (100%) were present at the duodenum but only 3/5 (60%) in the ileum. No clinicopathologic variables demonstrated a statistically significant association with discordance. We conclude that the level of discordance necessitates concurrent biopsy of both duodenum and ileum in all dogs with chronic GI signs. The rate of EATL-2 was lower than rates reported for cats.
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