定位：
♥ Mediastinal (junction) line: Ant. disrupted, Post. perserved
♥ Hilum overlay sign(+): anterior or posterior to hilum
♥ Location of lesion: 與 diaphragm 接觸的 lesion，如 pericardial cyst/aneurysm, Morgagni hernia, pleuropericardial cyst
♥ 利用anatomy的silhoutte sign:
(1)A-aorta, SVC, heart border: anterior
(2) Aortic arch: middle
(3) D-aorta: posterior
♥ Tissue density
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