Table 2.
Unilateral right and left distribution of colorectal liver metastases and portal anatomy
| Characteristics, | Right unilateral, N = 66 (73%)a | Left unilateral, N = 24 (27%)a | p-valueb |
|---|---|---|---|
| Number of CRLM | 1 (1–3) | 1 (1–1) | 0.03 |
| PV variations | |||
| Type 1 | 51 (77) | 17 (71) | |
| Type 2 | 3 (4.5) | 3 (13) | |
| Type 3 | 12 (18) | 4 (17) | |
| PV diameter | |||
| Main trunk | 13.7 (12.5–15.0) | 13.8 (12.2–14.2) | 0.70 |
| RPV | 11.3 (10.0–12.6) | 11.3 (10.3–12.1) | 0.60 |
| LPV | 10.5 (9.0–11.9) | 10.9 (10.1–12) | 0.20 |
| Ratio diameter RPV/LPV | 1.1 (1.0–1.3) | 1.1 (0.9–1.2) | 0.20 |
| PV branches angulation | |||
| RPV | 155 (145–168) | 158 (147–164) | > 0.90 |
| LPV | 97 (81–118) | 98 (84–116) | 0.90 |
| Predominant PVc | 0.30 | ||
| RPV | 43 (70) | 13 (57) | |
| LPV | 18 (30) | 10 (43) |
a
= n (%), median (interquartile range, IQR);
b
= Fisher's exact test, Kruskal-Wallis;
c
= primitive branch of the portal vein presenting the largest cross-sectional area
CRLM = colorectal liver metastasis; LPV = left portal vein; PV = portal vein; RPV = right portal vein