Y! Health News Search RSS Feed by Tue, 20 Oct 2009 09:03:44 PDT.
HealthDay - TUESDAY, Oct. 20 (HealthDay News) -- New research raises doubts about the long-held medical dogma that dangerous blood clots in the lungs, known as pulmonary emboli, originate from clots in the deep veins of the legs or other parts of the lower body, which then break up and travel up through the body.
