Of all the unfortunate places to be when you discover you have a blood clot, the worst has got to be 250 miles up in the sky, zooming around the world at 17,000 miles per hour aboard the International Space Station.
But in a study published last month in The New England Journal of Medicine, doctors detailed how they treated one such unlucky case. The astronaut was participating in a study on vascular flow in space and did a routine ultrasound scan on their neck. From the ground, doctors who saw the images noticed that there didn’t appear to be any blood flow in the astronaut’s left jugular vein. (The patient remains anonymous for privacy reasons.)