Concomitant Diagnosis and Therapeutic Response of Large-vessel Vasculitis and Hodgkin Lymphoma on 18 F-FDG PET/CT.

We report a case of a 23-year-old woman with concomitant Takayasu arteritis and nodular sclerosis classic Hodgkin lymphoma, both diagnosed by 18 F-FDG PET/CT. Treatment with ABVD chemotherapy, corticosteroids, and radiotherapy (without additional immunosuppressive therapy) led to parallel remission of both conditions. PET/CT after 2 chemotherapy cycles confirmed a complete metabolic response, sustained over 4 years. This case underscores the key role of 18 F-FDG PET/CT in diagnosing and monitoring both diseases and highlights the rare coexistence and concurrent evolution of large-vessel vasculitis and Hodgkin lymphoma, suggesting a possible paraneoplastic or indirect association that is seldom reported.