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(A) Pre-treatment and (B) post-treatment PET-CT of a patient with a stage IIA nodular sclerosing Hodgkin's lymphoma. The baseline FDG-PET shows advanced FDG avid disease. A first follow-up study shows complete metabolic response, whereas the CT scan shows residual mediastinal abnormalities. The patient was classified as having CRu (complete response unconfirmed) by International Workshop Criteria (IWC) and complete response by IWC + PET.
