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Pneumopericardium is defined by the presence of air in the pericardial sac. We present a 61-year-old cachectic woman who developed pneumopericardium after pericardiocentesis. She presented with complaints of fatigue and shortness of breath. The chest X-ray showed an increased cardiothoracic ratio, and echocardiographic examination showed a marked pericardial effusion. Pericardiocentesis was performed and a total of 860 ml hemorrhagic pericardial fluid was aspirated. At the end of the first week after removal of the catheter, control chest radiography showed air-fluid levels in the pericardial cavity, and echocardiography revealed dense air bubbles in the decreased pericardial effusion. As the patient was hemodynamically stable, she was monitored on medical treatment. However, five days later, pericardiocentesis was repeated due to a significant increase in the pericardial effusion despite decreased amount of air. As no etiologic factor could be elicited, a connective tissue disease was considered and a corticosteroid was added to her treatment, which resulted in a rapid decline in the pericardial effusion on follow-up chest radiography and echocardiography. She was discharged on steroid therapy.