“…Affected lymphatic vessels had a beaded and tortuous appearance in contrast to smooth veins. 98 , 100 – 102 , 104 , 106 , 107 , 111 , 112 , 115 Moreover, blood had a significantly faster uptake and clearance rate, leading to earlier enhancement and faster decreases of image intensity compared with lymphatic vessels. 102 , 107 , 111 , 115 , 116 Similar to lymphoscintigraphy and NIRF-L, severity staging has been proposed on the extent of DBF and visualized lymphatic vessels, which was significantly related to the ISL clinical scale.…”