blood clot
"Secretary of State and former First Lady Hillary Clinton was recently hospitalized due to a blood clot found in her brain during a follow-up MRI. Dr. Bradley Close, an interventional radiologist at Suburban Imaging said a blood clot is like a cork or plug. "Whatever vessel the blood clot is in, the vessel is like a tube that has a plug blocking the blood flow"
"A blood clot is like a big car crash that stops all of the other cars from going where they need to go "
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