An 18-year-old woman was stricken with severe headaches, vomiting, seizures, confusion and weakness in one arm early this month, strokelike symptoms that doctors at a Nevada hospital were shocked to see in someone so young.
Scans found several large blood clots blocking veins that drain blood from the brain, a condition that can disable or kill a patient.
Doctors performed a procedure to suction huge clots from her brain, only to find that new ones had formed.
Johnson & Johnson Covid-19 vaccine. One died, and their devastating cases led U.S. health officials to recommend on Tuesday that use of the vaccine be paused.