Table 3.
Predominance of right portal vein (RPV) or left portal vein (LPV) and intrahepatic distribution of colorectal liver metastasis (CRLM)
| Characteristics | Predominant RPV N = 123 (67%)a,b,c | Predominant LPV N = 61 (33%)a,b,c | p-valued |
|---|---|---|---|
| Distribution of CRLM | |||
| Bilateral | 67 (54) | 33 (54) | |
| Right unilateral | 43 (35) | 18 (30) | |
| Left unilateral | 13 (11) | 10 (16) | |
| Number of segments involved (right liver) | 2 (1–3) | 2 (1–3) | 0.60 |
| Number of segments involved (left liver) | 1 (0–2) | 1 (0–2) | 0.70 |
| Total number of CRLM | 3 (1–8) | 4 (1–5) | 0.70 |
| Number of CRLM in the right liver | 2 (1–5) | 2 (1–4) | 0.40 |
| Number of CRLM in the left liver | 1 (0–3) | 1 (0–2) | 0.60 |
| Ratio number of CRLM right/left liver | 1 (1.0–3.0) | 1 (1.0–2.0) | 0.70 |
| Ratio number of CRLM per segment (right liver) | 1 (1.0–2.0) | 1 (1.0–2.0) | 0.60 |
| Ratio number of CRLM per segment (left liver) | 1 (1.0–1.8) | 1 (1.0–2.0) | > 0.90 |
a
= n (%), median (interquartile range, IQR);
b
= primitive branch of the portal vein presenting the largest cross-sectional area;
c
= Sixteen patients presented an identical RPV and LPV diameter and were excluded;
d
= Fisher's exact test, Wilcoxon rank sum test