9 They usually form in regions of slow or disturbed flow in large venous sinuses and in valve cusp pockets in the deep veins of the calf (Fig 1) or in venous segments that have been exposed to direct trauma. Dr. William Lee is the founder of Cardiac Associates of North Jersey, PA located in Oakland, New Jersey. 3980 Colonnade Pkwy Birmingham, AL 35243 (205) 510-5000. Dr. Shallenberger has been ....