Phlebograms diagnostic of deep venous thrombus in 21 patients were compared with those taken three to twelve days later; the phlebograms of 25 additional cases were reviewed; and 13 patients were re-examined four to thirty-four months after the original attack. In the first week the thrombus appears loose; over the next fourteen days it becomes adherent to the wall and retracts. A vein obstructed by adherent thrombus may recanalize after several months. Phlebographic recognition of this progression may help in the management of patients with deep venous thrombus and in the prevention of sequels.
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Thomas et al. (1971) studied this question.