Blockage of blood vessel due to foreign substance lodged in the bloodstream. Endovascular procedures such as coiling, catheterization, and thrombolysis may contribute to lesion formation. Small particles of PVP-treated catheters, or other materials, may become lodged and form inflammatory lesions. Most foreign body emboli will cause respiratory symptoms and tachycardia before causing neurologic symptoms in the absence of a patent foramen ovale. Signs and symptoms may also include tiredness, weakness, hemorrhage, hematoma, transient hemiparesis, and edema. Silent or asymptomatic cases may not be discovered unless suspected, and cross-sectional imaging is used.