ISS blood clots. Bob Zimmerman, BehindtheBlack.com
Ultrasound examinations of the astronauts’ internal jugular veins were performed at scheduled times in different positions during the mission. Results of the ultrasound performed about two months into the mission revealed a suspected obstructive left internal jugular venous thrombosis (blood clot) in one astronaut. The astronaut, guided in real time and interpreted by two independent radiologists on Earth, performed a follow-up ultrasound, which confirmed the suspicion.