All are predisposing factors of Deep Vein thrombosis, except
Correct Answer: Subungual melanoma
Description: Fragmented thrombi from DVTs are carried through progressively larger veins and the right side of the hea before slamming into the pulmonary aerial vasculature. Depending on the size of the embolus, it can occlude the main pulmonary aery, straddle the pulmonary aery bifurcation (saddle embolus), or pass out into the smaller, branching aeries (Fig. 4-15). Frequently there are multiple emboli, occurring either sequentially or simultaneously as a shower of smaller emboli from a single large mass; in general, the patient who has had one PE is at high risk for more. Rarely, a venous embolus passes through an interatrial or interventricular defect and gains access to the systemic aerial circulation (paradoxical embolism). A more complete discussion of PEs is presented in Chapter 15; the following is an overview of the major functional one
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