When is an arm really a leg?

Flipping the X-ray showed Stefan Mundlos, MD, that his hunch was right — the patient's arms were peculiar and stiff because the elbows were actually knees. What Mundlos was looking at was the result of a rare and mysterious condition known as Liebenberg Syndrome. As his research now reveals, the disorder, in which… » 12/14/12 8:20am 12/14/12 8:20am