Experimental: ICG for CLMs

Preoperative preparation ICG solution dissolved in 5ml of normal saline (dose 0.5mg/kg) was inhaled 30 minutes before surgery.~Operation method After entering the chest cavity, the fluorescence endoscope was switched to the fluorescence display mode, and the fluorescence-stained normal lung tissue and non-stained lesion tissue could be clearly displayed through the display screen, and the external boundary of the lesion was marked with an electric hook. The mediastinal pleura and pulmonary pleura were opened along the boundary of the lesion, and the lung tissue was split along the gap between the lesion and the lung tissue with an electric coagulation hook and an ultrasonic knife, and the lesion arteries and bronchi were freed. Smaller blood vessels could be cut by Ligasure or ultrasonic knife directly, and thicker blood vessels and bronchi should be cut by Hemolock until the lesion resection was completed.