<unk>  can present with a various range of symptoms from sudden acute chest pain, shortness of breath, cough to no symptoms at all. Diagnosis of<unk>  depends on the associated or precipitating condition. On physical exam,<unk>  is associated with a specific sign known as Hamman's sign, which is the presence of mediastinal crunch or click present on auscultation over the cardiac apex and the left sternal border synchronous with the heartbeat.<unk>  can routinely be diagnosed by chest X-ray.<unk>  investigation of<unk>  for<unk>  is CT-scan of the chest.
Pneumomediastinum diagnostic study of choice
Pneumothorax diagnostic study of choice
Hemothorax diagnostic study of choice
Hemoptysis diagnostic study of choice
Pulmonary edema diagnostic study of choice
Aspiration pneumonia diagnostic study of choice
Pleural effusion diagnostic study of choice
Hemothorax echocardiography or ultrasound