Thrombosis is a rare cause of superior vena cava syndrome (SVCS). A 43-year-old male patient with SVCS due to thrombosis underwent investigation for the etiology of thrombus formation. He had been hospitalized several times because of lead intoxication in the past. Lead has a known thrombogenetic effect experimentally. This patient with superior vena cava thrombosis had thrombophilia that was probably due to lead intoxication. The etiologies of venous throm bosis and thrombogenetic effect of chronic lead exposure are discussed.
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