The 16 y/o male, was admitted due to sudden onset chest pain and tightness since last night. The chest pain with compressive character and radiation to left neck and left back. Vital sign: BP:117/60mmhg. TPR: 36.4/77/20. Laboratory data :WBC: 13300, Seg: 88.

The chest roentgenogram as below:

   根據上面的影像你的臆測是什麼？