Fig. 2

Two-dimensional conventional and contrast-enhanced ultrasound imaging of the thrombus at 1 h, 2 h and 7 days. a 1 h after thrombus formation, the surface of the thrombus was isoechoic (blue arrow). b 2 h after thrombus formation, volume increased and hyperechoic surface augmented (blue arrow). c 7 days after thrombus formed, uniformly hypoechoic core and slightly stronger surface echo (blue arrow). d 1 h after thrombus formation, ultrasound contrast enters freshly formed part of thrombus at surface (blue arrow), inconsistent with standard 2-dimensional morphology. e 2 h after thrombus formation, small thrombus (blue arrow) with obvious mobility on the surface of the thrombus, not shown by two-dimensional imaging. f No surface entry by contrast in thrombus of 7 days (blue arrow)