My dad had a pulmonary embolism a few years ago- it's scary stuff as if undetected it can result in a heart attack or stroke. It's unusual for someone to get it at varejao's age- could be a sign of a blood condition that leads to it clotting easily. I remember my dad was crying out in agony all night as the blood clot passed through his lungs. The medication is nasty stuff too, as they usually give a chemical to dissolve the clot and then some blood thinning medication, which combine to make you feel like absolute s***.
Hope he has a swift recovery.