Sonography is helpful for categorizing a palpable inguinal mass. Most lymph nodes are ooid. They typically hae 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）.