翻译：早期和及时诊断颈动脉易损性斑块破裂形成的自由漂浮血栓至关重要因为其存在脱落而导致更严重的卒中风险。

Early and timely diagnosis of free-floating thrombus formed by rupture of vulnerable carotid artery plaque is crucial, as its presence can lead to a higher risk of severe stroke due to embolization.