Abstract
Venous thrombosis of the lower extremity can be a crippling disease and, if pulmonary embolism results, it may be fatal. The incidence of this condition has been greatly reduced in the past decade because of a better understanding of some of the etiological factors, so that more adequate prophylactic measures may now be carried out. For practical purposes, venous thrombosis or, as some term it, thrombophlebitis, may involve both the superficial and the deep veins of the lower extremities. Early in the course of the disease the signs of inflammation, which many doctors think necessary for the diagnosis, may be absent. This is especially true when the deep venous system is involved. As a result of this absence, the term "bland" or "silent venous thrombosis" has come into use to describe this stage of the disease. Others have called this type phlebothrombosis, but this term is not so descriptive.

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