Figure 4. (a) High-resolution ultrasound image showing a normal lymph node in the right groin. It has a normal echogenic fatty hilum, with peripheral hypoechogenicity. (b) High-resolution ultrasound image showing an abnormal lymph node in the right groin. The node is hypoechoeic, irregularly shaped and has lost the central fatty hilum. The node demonstrated abnormal vascularity (not shown). Fine needle aspiration cytology was performed, which confirmed metastatic disease.