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Lower yield of available diagnostic tests for tuberculous meningitis (TBM) frequently causes delay in diagnosis. Recently, 18F-fluorodeoxyglucose positron emission tomography (FDG PET) has been used in infectious disorders such as pulmonary tuberculosis; however, it is rarely used in TBM. This study was aimed to ascertain the role of FDG PET in the diagnosis and determination of the extent of disease and prognosis in patients with TBM. After excluding unsuitable patients, 25 patients were subjected to whole-body PET–computed tomography (CT) image acquisition along with separate brain protocol with an integrated PET-CT device. FDG PET was found to be abnormal in 92% patients. Extracranial FDG uptake was observed in 80% patients. Most common extracranial site of involvement was lymph nodes (60%), followed by lung (56%), vertebral body (8%), genitourinary organs (8%), and spleen (4%). FDG PET observed extracranial involvement had 80% sensitivity and 20% specificity in detecting definite TBM cases. In conclusion, FDG PET may be a useful test in TBM evaluation.
Authors’ addresses: Harish Nigam, Shweta Pandey, Ravindra Kumar Garg, Rajesh Verma, Hardeep Singh Malhotra, Praveen Kumar Sharma, Neeraj Kumar, Imran Rizvi, Neera Kohli, and Ravi Uniyal, Department of Neurology, King George Medical University, Lucknow, India, E-mails: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, and email@example.com. Sanjay Gambhir and Vivek Kumar Saini, Department of Nuclear Medicine, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India, E-mails: firstname.lastname@example.org and email@example.com. Vimal Kumar Paliwal, Department of Neurology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India, E-mail: firstname.lastname@example.org; Amita Jain, Professor and Head, Department of microbiology, KGMU, Lucknow, India, E-mail: email@example.com.