Table 1 Frequency of type II endoleak according to the patency of IMA and number of patent LA.

	Number of patent LA with diameter≧2.0 mm
	none or 1	2 or more
Occluded IMA	8.3% (1/12)	50.0% (1/2)
Patent IMA with diameter<2.5 mm	46.2% (6/13)	66.7% (2/3)
Patent IMA with diameter≧2.5 mm	87.5% (14/16)	66.7% (2/3)

The frequency of type II endoleak was about 90% when IMA with diameter≧2.5 mm was patent regardless the number of patent LA with diameter≧2.0 mm. When IMA with diameter<2.5 mm was patent or 2 or more LA with diameter≧2.0 mm were patent, type II endoleak was detected about half of patients. IMA: inferior mesenteric artery; LA: lumbar artery