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Updated: Apr 15, 2026

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Role of dual time fluorodeoxyglucose (FDG) positron emission tomography-computed tomography in identifying
Anirudh V Nair1, C J Sandya2, G S Shagos3
1Department of Radiodiagnosis, Kerala Institute of Medical Science, Trivandrum, Kerala, India.
Abstract:
18-fluorodeoxyglucose positron emission tomography-computed tomography (PET-CT) is an integral part of imaging in the follow-up of head and neck malignancies. Very often distinguishing inflammatory/infective from malignant recurrence cannot be made confidently with standard uptake value (SUV) alone, as inflammatory lesions have shown to have a very high SUV, and in some cases both can co-exist. In such doubtful cases, dual time PET-CT (3-5 h delayed) is of paramount importance in confidently differentiating inflammatory/infective from a malignant cause.
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