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eISSN: 1643-3750

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FDG/PET uptake in asymptomatic multilobar Chlamydia pneumoniae pneumonia

Andrea Bianco, Gennaro Mazzarella, Danilo Rocco, Maurizio Gasperi, Roberto Di Marco, Luca Brunese

Med Sci Monit 2010; 16(6): CS67-70

ID: 880597


Background:    FDG-PET is a diagnostic imaging procedure effective in staging primary and recurrent cancer. False-positive uptake already has been described in both inflammatory and infectious respiratory diseases, although no reports associate Chlamydia pneumoniae infection to FDG uptake.
    Case Report:    An incidental diagnosis of asymptomatic multilobar pneumonia during screening for thyroid malignancy is reported. Three areas of pulmonary consolidation strongly positive on PET/CT scan, mimicking pulmonary malignancy were identified. Both radiologic features and serum IgM antibodies for Chlamydia pneumoniae suggested the diagnosis of an unusual presentation of a Chlamydia pneumoniae respiratory infection. Specific antibiotic therapy induced a complete resolution of the areas of pulmonary consolidation.
    Conclusions:    This case suggests that positive PET is not an absolute indicator for malignancy. Chlamydia pneumoniae respiratory infections can exhibit positive uptake on FDG-PET.

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