U.S. Secretary of State Hillary Clinton was lucky that, being the top U.S. diplomat, her medical team had thought to do a follow-up MRI after her concussion last month, medical experts told ABC News on Tuesday.

The doctors said that Clinton's latest health update -- cerebral venous thrombosis -- is a rare and potentially "life-threatening" condition, but one from which the globe-trotting secretary of state is likely to recover from.