Congenital narrowing of the left common iliac vein due to pressure from the overlying artery is called May-Thurner syndrome and can lead to deep vein thrombosis of the left leg. (more...)

Other sites

http://en.wikipedia.org/wiki/May-Thurner_syndrome

http://www.wrongdiagnosis.com/medical/iliac_vein_compression_syndrome.htm

http://www.ajronline.org/cgi/content/full/183/5/1523

http://www.dirjournal.org/text.php3?id=135

http://content.karger.com/ProdukteDB/produkte.asp?Aktion=ShowFulltext&ArtikelNr=63632&ProduktNr=224278

http://radiology.rsnajnls.org/cgi/content/full/233/2/361

http://lib.bioinfo.pl/pmid:17900842

http://www.medicalnewstoday.com/articles/45576.php

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