TY - JOUR T1 - Pneumomediastinum: a cause of chest pain JF - Heart JO - Heart SP - 448 LP - 448 DO - 10.1136/heart.87.5.448 VL - 87 IS - 5 AU - K Naganuma AU - M Ito AU - Y Aizawa Y1 - 2002/05/01 UR - http://heart.bmj.com/content/87/5/448.abstract N2 - A previously healthy 18 year old male visited our hospital for chest pain of sudden onset. Although the heart sounds were … ER -