Nonnecrotizing Granulomatous Lymphadenitis Mimicking Hodgkin Lymphoma Relapse by 18F-FDG PET/CT after Stem Cell Transplantation. Report of a Case

18F-FDG PET-CT has become the main procedure for staging and monitoring treatment response in patients with lymphoma. It can differentiate between active disease and necrosis/fibrosis in after treatment residual masses, mainly in Hodgkin Lymphoma patients. Persistence of FDG uptake is very suggestive of resistance or recurrence. However, there can be also some false positives (FP). Non necrotizing Granulomatous Lymphadenitis (NNGL) is a sarcoidosis-like inflammatory reaction and it can be a FP cause in PET-CT monitorization of HL treatment response. Here we present a case of a patient with HL who was NNGL PET positive after stem cell transplantation. *Correspondence to: Luis G Díaz, Nuclear Medicine Department, University Hospital of Salamanca, Spain, Tel: +34635038969; E-mail: lgdiaz@saludcastillayleon.es