Cystic Adenomatoid Pulmonary Malformation Masquerading as a Bronchogenic Cyst in an Adult: A Rare Case Report

Cystic adenomatoid pulmonary malformation (CAPM) is a congenital abnormality of lung which is rare in adults. Here, we report a case of 46-year-old female presented with dyspnea on exertion. Chest radiograph and computed tomography scan showed a single cyst in the posterior segment of right upper lobe in parahilar region with radiological diagnosis of bronchogenic cyst. However, the intrapulmonary location and the absence of cartilage in the cyst wall with multiple adjacent microscopic cysts were conclusive findings of Type I CAPM. Surgical resection is the treatment of choice to prevent future infections such as aspergillosis and potential risk of malignant transformation.