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FDG PET/CT in TB: Mimics, Pitfalls, and Limitations

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PET/CT in Tuberculosis

Abstract

One of the main drawbacks of fluorodeoxyglucose positron emission tomography/computed tomography (FDG PET/CT) is its lack of specificity in order to distinguish between different inflammations and/or malignancies, which comes as particularly important when evaluating tuberculosis, a disease known as a great mimicker, which can masquerade as various number of inflammatory or malignant disorders. Patients with cancer are more prone to develop active tuberculosis and vice versa, TB patients are at greater risk of lung cancer compared to normal population. Dual-phase FDG PET imaging has been tried for the differentiation of inflammation from malignancy with some promising results, but there are some controversies when it comes to patients with tuberculosis. On the other hand, there are some inflammatory diseases, such as sarcoidosis, and also infections with other Mycobacterium species which could be mistaken for TB on FDG PET/CT. Some difficulties in evaluation of disease activity and therapy response on FDG PET/CT have also been reported even in individuals with confirmed diagnosis of TB. Altogether, tuberculosis on FDG PET/CT can have a myriad of manifestation that sometimes can be perplexing to interpret even for experienced reader.

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Sobic Saranovic, D., Stojiljkovic, M. (2020). FDG PET/CT in TB: Mimics, Pitfalls, and Limitations. In: Sobic Saranovic, D., Vorster, M., Gambhir, S., Pascual, T. (eds) PET/CT in Tuberculosis. Clinicians’ Guides to Radionuclide Hybrid Imaging(). Springer, Cham. https://doi.org/10.1007/978-3-030-47009-8_10

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