...Lymph Nodes 淋巴结
Sonography is helpful for categorizing a palpable inguinal mass. Most lymph nodes are ovoid. They typically have an echogenic central area and a hypoechoic peripheral zone (Figure 20 ).
超声对可触及的腹股沟肿块的分类非常有帮助。大多数淋巴结是卵圆形的，一般表现为中央区呈等回声和周围区呈低回声（图20）.
Figure 20. A, Enlarged inguinal lymph node. Note the echogenic hilum. B, Color Doppler scan reveals the vascular hilum of the lymph node.
图20， A，腹股沟淋巴结增大，注意淋巴结门的回声。B，彩色多普勒扫描显示淋巴结的血管门。
...Pseudoaneurysm 假性动脉瘤
With the widespread increase in transfemoral vascular interventions and vascular reconstruction procedures, pseudoaneurysms in the groin are not uncommon. The pseudoaneurysm is seen as a localized fluid-filled structure, which may reveal pulsations. Swirling of echogenic blood may be seen on real-time examination within the cystic fluid-filled cavity. On Color Doppler examination, it reveals a typical yin-yang flow (Figure 21 ).
随着经股血管的介入和血管重建操作的普遍增多，腹股沟假性动脉瘤并不罕见，假性动脉瘤表现为局部充满液体的结构，并出现搏动，充满液体的囊腔内实时检查可见血液湍流回声，在彩色多普勒检查显示为典型的“阴阳”（yin-yang）血流（图21）。
Figure 21. Pseudoaneurysm of the common femoral artery.
图21， 常见的股动脉假性动脉瘤。
编辑：蓝色幻想
