Complications can include cardiac tamponade, myocarditis, and constrictive pericarditis. LCMV infections have also been associated with pancreatitis, pneumonitis, myocarditis and pericarditis. Common misdiagnoses include myocardial infarction, pancreatitis, lung abscess, pericarditis, and spontaneous pneumothorax. Peptostreptococci can cause fatal endocarditis, paravalvular abscess, and pericarditis. One of the most feared complications of acute pericarditis is cardiac tamponade. It consists of fever, pleuritic pain, pericarditis and/or a pericardial effusion. Pneumococcus or tuberculous pericarditis are the most common bacterial forms. Ketorolac is used to treat idiopathic pericarditis, where it reduces inflammation. Chronic pericarditis however is less common, a form of which is constrictive pericarditis. The diagnosis of constrictive pericarditis is often difficult to make. Chest pain is one of the common symptoms of acute pericarditis. It is also used for pericarditis and patent ductus arteriosus. There are several causes of acute pericarditis. Dressler's syndrome, a reaction following larger infarcts and a cause of pericarditis is also possible. The most common cause of pericarditis worldwide is infectious pericarditis with tuberculosis.