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  Indian J Med Microbiol
 

Figure 14: Fluoro-deoxy-glucose positron emission tomography/computed tomography (PET/CT) (a) after 6 months as a part of surveillance in a patient with Hodgkin's lymphoma treated with six cycles of chemotherapy and achieved complete remission showing uptake in the right level II cervical lymph nodes raising suspicion of recurrent disease. Patient underwent FNAC from the involved lymph nodes, which revealed only inflammation and no evidence of tumor. On retrospect, these lymph nodes were not involved in baseline scan (b) This image highlights poor positive predictive value (PPV) of PET/CT in surveillance of patients with lymphoma. According to literature, PPV is only around 21% for PET/CT findings in surveillance of patients with lymphoma.[13] Comparison with previous studies might help in avoiding false positive interpretations. Also false positive interpretations are more likely to occur when the new uptake occurs in supra-diaphragmatic locations than in infra-diaphragmatic locations.[14]

Figure 14: Fluoro-deoxy-glucose positron emission tomography/computed tomography (PET/CT) (a) after 6 months as a part of surveillance in a patient with Hodgkin's lymphoma treated with six cycles of chemotherapy and achieved complete remission showing uptake in the right level II cervical lymph nodes raising suspicion of recurrent disease. Patient underwent FNAC from the involved lymph nodes, which revealed only inflammation and no evidence of tumor. On retrospect, these lymph nodes were not involved in baseline scan (b) This image highlights poor positive predictive value (PPV) of PET/CT in surveillance of patients with lymphoma. According to literature, PPV is only around 21% for PET/CT findings in surveillance of patients with lymphoma.<sub>[13]</sub> Comparison with previous studies might help in avoiding false positive interpretations. Also false positive interpretations are more likely to occur when the new uptake occurs in supra-diaphragmatic locations than in infra-diaphragmatic locations.<sup>[14]</sup>