Hodler J, Vock P
Rofo. 1987 Jun;146(6):654-7. doi: 10.1055/s-2008-1048560.
The anterior cardiophrenic angle (ACA) is the lowermost anterolateral portion of the mediastinum. It is limited inferiorly by the diaphragm, anteriorly by the chest wall, posteriorly by the pericardium, and laterally by the parietal pleura. In 20% computed tomography (CT) of the normal ACA shows the diaphragm as a linear structure, and in 15% as a pseudotumorous structure that has to be differentiated from real tumours. The inferior sternopericardial ligament appears as a linear structure in 22%. In 3% nodular structures of up to 8 mm of diameter are visible in the normal ACA, probably corresponding to cardiophrenic angle nodes. These findings suggest that, exceptionally, normal cardiophrenic angle nodes may be demonstrated by CT.
心前膈角（ACA）是纵隔最下部的前外侧部分。其下界为膈肌，前界为胸壁，后界为心包，外侧为壁层胸膜。在正常ACA的计算机断层扫描（CT）中，20%显示膈肌为线性结构，15%显示为假肿瘤样结构，必须与真正的肿瘤相鉴别。22%的情况下，胸骨心包下韧带表现为线性结构。在3%的正常ACA中可见直径达8mm的结节状结构，可能对应于心膈角淋巴结。这些发现表明，在例外情况下，CT可能显示正常的心膈角淋巴结。
