RESUMO
Objective To investigate the value of 18F-FDG PET-CT in detection and accurate staging of extranodal non-Hodgkin lymphoma (NHL).Methods The results of PET-CT of 94 patients with NHL were retrospectively analyzed.The consistency of checking out lesions and accurate staging by PET-CT were compared with those by other imaging examination in extranodal NHL.Results 432 lesions were checked out by PET-CT, including 319 (73.8 ％) lymphoid tissues and organs with the average SUVmax of 13.4 (3.4-33.4), and 113 (26.2 ％) extranodal lesions with the average SUVmax of 13.5 (3.1-55.0).The detection consistent rate between CT and PET-CT for lymphoid tissues and lymph organ lesions was 95 ％, while the consistent rate of the extranodal lesions was only 54.9 ％.The detection rates of PET-CT for soft tissue, bone and gastrointestinal lesions were higher than those of CT, but the detection rate for the bone marrow lesion was lower than that for the bone marrow cytology.According to the results of PET-CT, the stages of 29 patients (31.0 ％) were re-adjusted, including up-regulated for 75.9 ％ (22/29) because of high detection rates of PET-CT for soft tissue and skeletal lesions, and down-regulated for 24.1％ (7/29) mainly due to the strong resolution capability of PET-CT for detection of non-neoplastic lymph nodes and spleen increasing or effusion.Conclusion 18F-FDG PET-CT can improve the detection rate of NHL extranodal lesions, especially for diffuse non-mass lesions in bone and soft tissues, which facilitates the accurate lymphoma staging.