One of the limitations of PET/MRI is poor evaluation of lung parenchyma with free breathing sequences. In this study, 41 patients with gynecological malignancies underwent PET/MRI with rapid single breath hold lung acquisition after PET/CT. The CT and MRI of the lungs were reviewed blindly for detection of pulmonary nodules 4mm or larger. The study showed that there was no significant difference between the CT and single breath hold MRI using Chi square test. Improved detection of small pulmonary nodules using single breath hold sequence would increase the feasibility of stand-alone PET/MR imaging for clinical staging in oncologic patients.