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The arteria circumflexa ilium profunda. This artery (and two other vessels) is presented following an old tradition about the word ilium, which genitive singular is commonly ilii. The argument is that ilium was selected as a genitive plural form. This is not really convincing, because each artery serves a single ilium! But it was the generally accepted form of this term at the time, already by the BNA. The present version of the terminology has decided to maintain this term.A discussion of this exception can be found in an article by Elena Marechova in 2001 On the new anatomical nomenclature (see Ann Anat (2001) 183:201-207).
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