The aim of this study is to compare hypertrophy of the FLR after PVE with microparticles to hypertrophy after PVE with cyanoacrylate in a material large enough to answer the study question. In addition, other factors that may influence the degree of hypertrophy will be evaluated in a multivariable analysis.

The hypothesis is: PVE with cyanoacrylate is superior to PVE with microparticles in terms of FLR hy-pertrophy.

With expansion of indications for major liver surgery, portal vein embolization (PVE) is increasingly used in order to induce hypertrophy of the future liver remnant (FLR). De-spite vide variety of materials available to occlude the portal veins the most commonly used are cyanoacrylate and microparticles/spheres. Earlier studies have failed to show superiority of one over the other in terms of hypertrophy of the FLR while PVE with cy-anoacrylate seems to be less time consuming. Two small previous studies from single centers have shown greater growth by cyanoacrylate compared to particles (1) with 90 included patients and the second study with 34 included patients (2), but larger reviews have failed (3). Cyanoacrylate might give a more robust FLR hypertrophy (4) . The main problem in evaluating previous studies has been the large heterogeneity and the often poorly described study populations.

Inclusion Criteria: Over 18 years old. Planned for portal vein embolization. -

Exclusion Criteria:

-

Patients undergoing portal vein embolization during the study period 2013 - 2021 in Linköping University Hospital, Karolinska Comprehensive Cancer Center and Skåne University Hospital Lund.