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The results of early autopsy and modern studies showed the incidence of IVC to be 20% to 49%.[sup][4],[5],[6],[7],[8],[9],[10] In this study, 37.8% of patients had a LCIV compression degree ≥25%, while 9.8% had a compression degree ≥50%; our results also demonstrated that LCIV compression was very common.
In our study, the LCIV compression degree of young women group was significantly different from that of other groups.
The degree of venous compression was calculated as the diameter of the common iliac vein at the site of maximal compression divided by the mean diameter of the uncompressed proximal and caudal left common iliac vein (LCIV).
Iliac vein compression syndrome (IVCS), also known as May–Thurner syndrome or Cockett syndrome, is characterized by left common iliac vein (LCIV) compression by the right iliac artery (RIA) and the fifth lumbar vertebra.
They described the development of “intraluminal spurs” in the LCIV. They postulated that this was due to the combination of chronic arterial pulsations by the RIA and mechanical compression leading to the development of intimal hypertrophy of the LCIV.
Exclusion criteria were: (1) scanning parameters> 5 mm, or unclear imaging; (2) expansion from the inferior vena cava to the LICV (we identified patients with vein dilation from the inferior vena cava to the LCIV on CT evaluation; we thought that this might affect the calculation of the stenosis rate); (3) congenital anomalies of the inferior vena cava, RIA, or LCIV; (4) history of trauma, abdominal surgery, or vascular bypass surgery; (5) LCIV compressed by tumor, foreign matter, or implant; (6) stent implantation in the inferior vena cava, RIA, or LCIV.
We divided the LCIV into proximal, middle, and distal segments and recorded the diameter proximal and distal to the crossing site of the RIA over the LCIV and at the site of crossing.
We evaluated the patients' medical records after measuring the LCIV compression degree.
The mean compression degree of the LCIV in the entire population was 16% (4%, 36%) [Figure 2].
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