Fig. 4From: Thrombus formation in the suprahepatic inferior vena cava after microwave ablation in patients with hepatic metastasis: a case reportIntraoperative observations and the procedure for microwave ablation A: A medium-sized nodule of approximately 18 × 9 mm with poorly defined borders and uneven internal echogenicity (red arrow ) was visible in S4 on ultrasound. Ultrasonography showed enhancement of the lesion(white arrow). B: The hepatic mass in S4 was selected as the target for ablation(red arrow)Back to article page