BACKGROUND: Evolution of indolent to aggressive lymphoma has been described in dogs but is difficult to distinguish from the de novo development of a second, clonally distinct lymphoma. Differentiation of these scenarios can be aided by next generation sequencing (NGS)-based assessment of clonality of lymphocyte antigen receptor genes. CASE PRESENTATION: An 8-year-old male intact Mastiff presented with generalized lymphadenomegaly was diagnosed with nodal T zone lymphoma (TZL) based on cytology, histopathology, immunohistochemistry and flow cytometry. Thirteen months later, the dog re-presented with progressive lymphadenomegaly, and based on cytology and flow cytometry, a large B cell lymphoma (LBCL) was diagnosed. Sequencing-based clonality testing confirmed the de novo development of a LBCL and the persistence of a TZL. CONCLUSIONS: The occurrence of two distinct lymphoid neoplasms should be considered if patient features and tumor cytomorphology or immunophenotype differ among sequential samples. Sequencing-based clonality testing may provide conclusive evidence of two concurrent and distinct clonal lymphocyte populations, termed most appropriately "composite lymphoma".
- Klíčová slova
- Antigen receptor gene rearrangement, Canine, Clonality, Composite lymphoma, Dog, Lymphoma, Lymphosarcoma, PARR,
- MeSH
- antitumorózní látky alkylující aplikace a dávkování terapeutické užití MeSH
- antitumorózní látky hormonální aplikace a dávkování terapeutické užití MeSH
- chlorambucil aplikace a dávkování terapeutické užití MeSH
- difúzní velkobuněčný B-lymfom komplikace patologie veterinární MeSH
- lymfom T-buněčný komplikace patologie veterinární MeSH
- nemoci psů patologie MeSH
- prednison aplikace a dávkování terapeutické užití MeSH
- psi MeSH
- zvířata MeSH
- Check Tag
- mužské pohlaví MeSH
- psi MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- kazuistiky MeSH
- Názvy látek
- antitumorózní látky alkylující MeSH
- antitumorózní látky hormonální MeSH
- chlorambucil MeSH
- prednison MeSH
