Preoperative assessment of vascular anatomy of inferior mesenteric artery by volume-rendered 3D-CT for laparoscopic lymph node dissection with left colic artery preservation in lower sigmoid and rectal cancer

Table 1 Medical conditions of patients examined in this study

Medical conditions	n
Aortic aneurysm	32
Arteriosclerosis	26
Varicose veins	5
Takayasu’s arteritis	3
Angina pectoris	1
Myocardial infarction	1
Cerebral infarction	1
Hypertension	1
Thrombosis	4
Total cardiovascular disease	74
Colon cancer	9
Hepatocellular carcinoma	5
Pancreatic cancer	3
Malignant lymphoma	2
Esophageal cancer	1
Total neoplasm	20
Myoma uteri	3
Pancreatic cyst	2
Cholecystolithiasis	1
Total others	6

Table 2 Distance from IMA root to LCA root and branching types of IMA

Sex	n	Age (range)/yr	Distance(range)/min	98 patients withbranching type
				A	B	C	D
Male	63	68.7 (30-89)	41.8 (25.3–73.5)	6	28	21	7
Female	37	67.5 (20-90)	42.3 (23.2–75.0)	4	17	6	9
Total	100	68.3 (20-90)	42.0 (23.2–75.0)	10	45	27	16

LCA was missing in two patients (1 male and 1 female). D: Branching type undetermined.

Table 3 Distance from IMA root to LCA root in different branching types

Branching type	Mean distance (mm) (SD)
Type A	44.1 (7.36)
Type B	42.2 (10.2)
Type C	38.3 (7.41)
All (n = 82)	41.3 (9.15)