When I was in 4th grade, I woke up one morning with a swollen right leg. After a long day in Children’s Hospital in Boston and a number of tests, I went home with the medical equivalent of “we have no idea” — better known as “idiopathic lymphedema.” After a very painful test involving injections in between my toes, they determined the lymphatic drainage system in my lower right leg wasn’t working, and suspected it had not formed properly. This apparently is a 1 in 100,000 shot.