18FDG PET-Positive Congenital Pulmonary Airway Malformation Mimicking Lung Cancer.

ABSTRACT: Adult cases of type 2 congenital pulmonary airway malformation (CPAM) are extremely rare, and no PET/CT findings have been reported for CPAM. We encountered a case of 18FDG PET-positive CPAM mimicking lung cancer in a 45-year-old asymptomatic man. CT revealed a large cavitary mass in the left lower lobe. SUVmax measured by 18FDG PET was 3.5. The patient underwent video-assisted thoracoscopic lobectomy on suspicion of CPAM with/or lung cancer. Histologically, no neoplastic cells were present, and the lesion was consistent with type 2 CPAM. An adenomatoid proliferative pattern and granulomatous lesions may have contributed to a PET/CT false-positive result.