“…Most authors agree, however, that recanalization can be seen within days in patients on fibrinolytic therapy, within weeks to months in patients on heparin-dicoumarol treatment and within months to years in patients without therapy (Bergvall & Hjelmstedt, 1968;Becker, Borgstrom & Saltzman, 1970;Thomas & McAllister, 1971;Common, et al, 1976;Arnesen, Hoiseth & Ly, 1982;Rabinov & Paulin, 1983). In addition, small and distal thrombi have more often disappeared on repeat phlebograms than femoral and iliac thrombi (Young, Thomas & Browse, 1974;May & Nissl, 1979).…”