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Rissi DR, Avery AC, Burnett RC. T-cell-rich, large B-cell lymphoma in the brain of a horse. J Vet Diagn Invest 2023; 35:327-331. [PMID: 36946511 PMCID: PMC10185986 DOI: 10.1177/10406387231164368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023] Open
Abstract
T-cell-rich, large B-cell lymphoma (TCRLBCL) is the most commonly diagnosed type of lymphoma in horses. Here we describe the clinical signs, neuropathology, immunohistochemistry (IHC), and PCR for antigen receptor rearrangement (PARR) analysis results of a TCRLBCL in the brain of an 8-y-old male Quarter Horse that was euthanized after acute anorexia, tremors, head pressing, falling, blindness, incoordination, and seizures. Autopsy revealed a firm, smooth, pale-yellow mass that expanded both lateral ventricles and the adjacent subcortical white matter. Histologically, the mass consisted of a densely cellular neoplasm composed of large, CD79+ neoplastic B-lymphocytes admixed with sheets of small, CD3+ reactive T-lymphocytes, Iba1+ histiocytes, MUM1+ plasma cells, and rare eosinophils supported by a fine fibrovascular stroma. Formalin-fixed, paraffin-embedded tissue scrolls were retrieved and subjected to PARR analysis, which revealed a clonal reaction in the immunoglobulin gene and a polyclonal reaction for the T-lymphocyte receptor gene, consistent with a neoplastic B-lymphocyte and reactive T-lymphocyte proliferation. The diagnosis of TCRLBCL was suspected histologically and confirmed based on IHC and PARR analysis.
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Affiliation(s)
- Daniel R. Rissi
- Athens Veterinary Diagnostic Laboratory, Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - Anne C. Avery
- Department of Microbiology, Immunology, and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA
| | - Robert C. Burnett
- Department of Microbiology, Immunology, and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA
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Kondratjeva J, Julien F, Coutelier C, Humeau L, Moog F, Combarros D, Fourquaux I, Pressanti C, Delverdier M, Moore PF, Cadiergues MC. Cutaneous epitheliotropic T-cell lymphoma in a donkey - a case report. BMC Vet Res 2022; 18:267. [PMID: 35821128 PMCID: PMC9275177 DOI: 10.1186/s12917-022-03365-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 06/28/2022] [Indexed: 05/31/2023] Open
Abstract
Background Cutaneous epitheliotropic T-cell lymphoma is a malignant tumour of the skin already reported in humans, dogs, cats, horses, and other species, but not previously in donkeys. The standard diagnosis is based on clinical, morphological and immunophenotypic data. Differentiation of malignant versus benign proliferation of lymphocytes is crucial; in ambiguous cases T-cell receptor gamma (TRG) molecular clonality should be tested. In the present paper, we report a case of mycosis fungoides diagnosed in a donkey whose diagnosis was based on clinical, histological and immunohistochemical aspects and a positive TRG clonality test. Case presentation A twenty-five-year-old donkey gelding was referred with a mildly pruritic, generalised and severe exfoliative dermatosis. Otherwise, the animal was clinically healthy, though mildly underweight. Dermatological examination revealed severe generalised alopecic and exfoliative dermatitis, occasionally eroded, with high number of large, thin, greyish scales. All mucocutaneous junctions except the hoofs were affected. Ectoparasites and dermatophytes were ruled out. The complete blood count and blood smear evaluation revealed mild normocytic normochromic anemia. The biochemistry panel showed mild hyperproteinemia with albumin within the normal range. Protein electrophoresis showed moderate polyclonal hypergammaglobulinemia. Histological findings were characterised by interface dermatitis with massive exocytosis in the epidermis of a homogenous population of lymphoid cells showing atypia. Clusters of neoplastic cells were present within the epidermis forming Pautrier “microabscesses”. These findings are consistent with cutaneous epitheliotropic lymphoma. Immunohistochemical staining revealed uniform labelling of the neoplastic cells for CD3, and lack of expression of CD20 (a B cell lineage associated marker). Molecular clonality PCR (PARR) was performed using equine TRG primers; this revealed a clonal rearrangement in a heavy polyclonal background. Transmission electronic microscopy showed multiple lymphocytes with convoluted or cerebriform nuclei. Conclusions This case report provides the first evidence of clinical, histopathological, immunophenotypic features, electron microscopy findings and molecular analysis of a cutaneous epitheliotropic T-cell lymphoma (mycosis fungoides) in a donkey. Our observations suggest that cutaneous T-cell lymphoma should be included in the differential diagnoses of exfoliative dermatitis, even those progressing in a chronic pattern and/or with few or no pruritus.
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Affiliation(s)
| | | | - Céline Coutelier
- Small Animal and Equine Hospital, ENVT, Université de Toulouse, Toulouse, France
| | - Louis Humeau
- Small Animal and Equine Hospital, ENVT, Université de Toulouse, Toulouse, France
| | - Fabien Moog
- Small Animal and Equine Hospital, ENVT, Université de Toulouse, Toulouse, France
| | - Daniel Combarros
- Small Animal and Equine Hospital, ENVT, Université de Toulouse, Toulouse, France.,INFINITy, Université de Toulouse, CNRS, UPS, InsermToulouse, France
| | - Isabelle Fourquaux
- Centre de Microscopie Electronique Appliquée À La Biologie, Université de Toulouse, Toulouse, France
| | - Charline Pressanti
- Small Animal and Equine Hospital, ENVT, Université de Toulouse, Toulouse, France.,INFINITy, Université de Toulouse, CNRS, UPS, InsermToulouse, France
| | - Maxence Delverdier
- Basic Sciences Department, Université de Toulouse, ENVT, Toulouse, France.,IHAP, Université de Toulouse, INRAE, ENVT, Toulouse, France
| | - Peter F Moore
- Leukocyte Antigen Biology Laboratory, UC Davis, VM PMI, Davis, CA, USA
| | - Marie Christine Cadiergues
- Small Animal and Equine Hospital, ENVT, Université de Toulouse, Toulouse, France. .,INFINITy, Université de Toulouse, CNRS, UPS, InsermToulouse, France.
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