DENVER
04/30/2012 07:19 pm ET

Cory Richards, Boulder Photographer For National Geographic, Airlifted Off Everest

A National Geographic climber and photographer was airlifted off Mount Everest Saturday after suffering a possible, though as yet undiagnosed, pulmonary embolism—a blockage of an artery in the lungs, often due to a blood clot.

Read more on National Geographic News

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