http://slideplayer.com/3454026/12/images/5/What+is+a+saddle+thrombus%3A+A+thrombus+is+a+clot+that+forms+in+the+bloodstream%2C+in+this+case+usually+in+the+heart.+When+it%E2%80%99s+dislodged+from+the+heart+and+enters+the+aorta+it+ends+up+lodging+itself+at+the+bifurcation+of+this+large+artery+as+it+branches+off+into+the+smaller+arteries+that+supply+blood+to+the+hind+limbs.+When+it+gets+stuck+it%E2%80%99s+now+called+an+embolism%2C+and+the+result+in+the+case+of+a+saddle+thrombus+%28an+embolism+at+the+base+of+the+aorta%29+is+that+it+cuts+off+the+main+blood+supply+to+the+back+legs%3B+an+extremely+painful+condition..jpg