False-positive FDG-PET imaging of the thymus of a child with Hodgkin's disease.

During the evaluation of a child who had completed treatment for Hodgkin's disease, a PET study strongly suggested recurrent disease in the mediastinum. Biopsies were obtained and revealed normal thymic tissue only, with no evidence of recurrent disease. The ongoing difficulty in establishing accurate disease status in patients treated for Hodgkin's disease is discussed, along with recommendations for treating pediatric patient populations.