Rohrer M J, Cutler B S
Division of Vascular Surgery, University of Massachusetts Medical School, Worcester 01655.
Surgery. 1988 Sep;104(3):572-4.
Congenital anomalies of the inferior vena cava (IVC) are not unusual and may complicate the placement of caval interruption devices. A duplicated IVC was demonstrated by venography in a patient with left iliofemoral venous thrombosis. A Greenfield filter was placed in each cavum from a right internal jugular vein approach. Because anomalies of the IVC are common, ascending venograms should be obtained in all patients who undergo caval interruption to document the number and position of the IVC, the location of the caval bifurcation, and the diameter of the IVC, as well as to identify the presence of thrombus within the lumen of the IVC. Unrecognized anomalies of the IVC may contribute to the incidence of recurrent pulmonary embolus after Greenfield filter placement.
下腔静脉（IVC）先天性异常并不罕见，可能会使腔静脉阻断装置的放置复杂化。在一名患有左髂股静脉血栓形成的患者中，静脉造影显示存在重复下腔静脉。通过右颈内静脉途径在每个腔中放置了一个格林菲尔德滤器。由于下腔静脉异常很常见，对于所有接受腔静脉阻断的患者都应进行上行静脉造影，以记录下腔静脉的数量和位置、腔静脉分叉的位置、下腔静脉的直径，以及识别下腔静脉腔内血栓的存在。未被识别的下腔静脉异常可能会导致格林菲尔德滤器放置后复发性肺栓塞的发生率增加。
