• Ying Zhao, Yongxiang Zhang, Qi Leng, Zhenwu Li, Peng Pang, and Xiaoli Qi.
• Department of Respiratory.
• Medicine (Baltimore). 2019 Jun 1; 98 (24): e16057.

RationaleCongenital pulmonary airway malformation (CPAM) is a rare developmental deformity of the lower respiratory tract. The disease occurs more in newborns. However, on rare occasions, CPAM can be found in adults. Radiologic features of CPAM include cystic or solid mass pattern. In an elderly patient, CPAM can be easily misdiagnosed as lung cancer.Patient ConcernsA 66-year old woman was admitted with complaints of chronic cough, expectoration. Her past history was unremarkable with no history of tuberculosis or smoking. Physical examination was normal. Computerized tomography of the chest showed an irregular cystic lesion in right lower lobe.DiagnosisHistopathological results confirmed the diagnosis of CPAM.InterventionThe right pulmonary wedge resection was performed via thoracoscopic surgery.OutcomesOn follow up 1 year later, the patient is asymptomatic.LessonsCPAM is rare in adults, and imaging cannot accurately distinguish CPAM from thin-walled cystic lung cancer. Hence, histopathology is mandatory to confirm the diagnosis.

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