Figure 2.

Preoperative CT-guided lipiodol marking for localization of pulmonary metastases. (A) A 52-year-old man with a 7.5-mm tumor in RS2, located at a depth of 27.9 mm from the pleural surface. (B) Lipiodol marking was performed in the supine position. The three-dimensional deviation between the lipiodol spot and the lesion was 13.6 mm. Based on this positional relationship, the lesion was classified as deep. The surgical margin was 22 mm, and an M/T ratio ≥1 was achieved. (C) A 78-year-old man with a 10.8-mm tumor in RS10, located 31.7 mm from the pleural surface. (D) Lipiodol marking was performed in the prone position. The three-dimensional deviation between the lipiodol spot and the lesion was 13.5 mm. Based on this positional relationship, the lesion was classified as shallow. The surgical margin was 6 mm, and the M/T ratio was <1. Red spots/arrows: lesion; yellow spots: lipiodol spot. CT, computed tomography; M/T, margin-to-tumor.