Abstract
NK/T cell lymphoma in the sacroiliac joint is very rare. We reportfluorine-18-fluorodeoxyglucose (18F-FDG) positron emission tomography/computed tomography (PET/CT) findings of NK/T cell lymphoma in the sacroiliac joint in a 48-year-old man. On 18F-FDG PET/CT image, it manifested a soft tissue mass with adjacent bone destruction in the sacroiliac joint, which had intense 18F-FDG uptake. The final pathology supported a diagnosis of NK/T cell lymphoma. Our case added the knowledge of another rare site of NK/T cell lymphoma, which should be regarded as a differential diagnosis for sacroiliac joint mass with intense 18F-FDG uptake.
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