On an echocardiogram, a pericardial effusion makes the heart look like it's dancing within the pericardium, whereas chronic pericarditis shows the stiff serous pericardium restricting the heart's movement.

超声心动图下，心包积液致使心脏如同在心包腔内“舞蹈”；而慢性心包炎表现为增厚的心包限制心脏活动。