Giant pulmonary bullae mistaken for pneumothorax.

Differentiating between giant pulmonary bullae and pneumothorax can pose a challenge in clinical settings. A chest CT scan during the patient's health assessment revealed that approximately 40% of the right chest cavity was filled with air, leading to incomplete expansion of the right lung. The patient was initially misdiagnosed with pneumothorax in the emergency department and subsequently underwent closed thoracic drainage without experiencing any improvement in symptoms. Upon further examination through thoracoscopy, the patient was correctly diagnosed with a giant pulmonary bulla. Upon reviewing the patient's chest CT scan, we were able to identify key distinguishing features between giant pulmonary bullae and pneumothorax.