Non-Hodgkin's lymphomas (NHL) quite often present in the neck but are seldom accompanied with cellulitis at the first diagnosis of the disease. We report a 56 year old woman with gradually neck swelling, which was initially treated as cellulitis. After examined by ultrasonography, computed tomography and after pathologically assessments, the diagnosis of large B-cell lymphoma was made. This case highlights the usefulness of fluorine-18-fluorodeoxyglucose positron emission tomography (¹⁸F-FDG PET/CT) in staging and assessing treatment response in NHL.
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