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01 June 2010

FDG/PET uptake in asymptomatic multilobar Chlamydia pneumoniae pneumonia

Andrea BiancoABCDEF, Gennaro MazzarellaBCDE, Danilo RoccoCEF, Maurizio GasperiCDE, Roberto Di MarcoCDE, Luca BruneseACDE

Med Sci Monit 2010; 16(6): CS67-70 :: ID: 880597

Abstract

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.

Keywords: Pneumonia - microbiology, Multiple Pulmonary Nodules - microbiology, Immunoglobulin M - immunology, Goiter - radionuclide imaging, Fluorodeoxyglucose F18 - diagnostic use, False Positive Reactions, Chlamydophila pneumoniae - metabolism, Anti-Bacterial Agents - therapeutic use, Positron-Emission Tomography - methods, Radiopharmaceuticals - diagnostic use

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750