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KMID : 0870419980020020069
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Korean Journal of Hepato-Biliary-Pancreatic Surgery
1998 Volume.2 No. 2 p.69 ~ p.74
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Portal Venous Branching of the Ⅷ Segment of the Liver: CT and Sonographic Examination
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Lee Hong-Gee
Nam Young-Soo
Lee Kwong-Soo
Kim Yong-Soo
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Abstract
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Background: The segmental Ⅷ portal vein branches into multiple subsegmental branches and the exact pattern of branching has not been readily identified. An integrated view of its branching pattern would help in hepatic resection
extending into the Ⅷ segment as well as in subsegmentectomy.
Methods: Forty spiral CT films were examined serially to determine the main Ⅷ portal branches. Twenty sonograms were taken horizontally on the subcostal area and/or intercostal spate and vertically on the intercostal space.
Results: On CT examination, the main Ⅷ segmental portal vein branches were dorsal(D) and ventral(V) branches. These were observed in 38(/40). On the dome area, a branch of middle hepartic vein(S8MHV) was observed running between V and D in 19. Another vertical portal branch on the dorsomedial(M) part of the liver was observed in 5. Just before bifurcation or trifurcation, a relatively large dorsolaterally Turnning branch(L) in the horizontal plane was observed in 26. Smaller but significant lateral branches were observed to originate from V and/or D. On sonography, D and V branches were present in all cases(20). L was observed in 8 and M in 3. S8MHV between V and D was observed in 6 and a branch of the right hepatic vein(S8RHV) below D in 8.
Conclusion: The Ⅷ segmental portal vein can be viewed as branching into (L)DV(M) with smaller branches from V and/or D. S8MHV seems to divide the V and D subsegments and S8RHV may drain the dorsal part of S8 or it may be dividing far dorsal area(supplied by L) from D subsegment.
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KEYWORD
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Portal vein, Ⅷ Segment
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