Publication details

Composite lymphoma of concurrent T zone lymphoma and large cell B cell lymphoma in a dog



Year of publication 2019
Type Article in Periodical
Magazine / Source BMC Veterinary Research
MU Faculty or unit

Central European Institute of Technology

Keywords Canine; Clonality; Dog; Lymphoma; Lymphosarcoma; Antigen receptor gene rearrangement; PARR; Composite lymphoma
Description 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".
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