Clinical Importance of Main Portal Vein and Right Portal Vein Variations: A Prevalence Study With 128-Slice Multidetector Computed Tomography.

Objectives: The portal vein variation type significantly affects the outcome of transplant surgery, hepatectomies, and interventional radiological procedures. To reveal variation types, especially rare types, we used high-technology multidetector computed tomography.

Materials And Methods: We evaluated multiphase abdominal multidetector computed tomography scans of 278 consecutive patients. Multidetector computed tomography scans were processed for axial, coronal, and axial-oblique multiplane reformation and for maximum intensity projection. Variations of the main portal vein and right portal vein were simulta-neously analyzed by 2 radiologists. Prevalence of each variation and differences in sexes were investigated.

Results: Variant anatomy was detected in 29.5% of main portal veins and 20.9% of right portal veins. There was no statistical difference between sexes. Type 3 was reported as the most frequent variant of main portal vein, whereas type 4 was the most frequent variant of right portal vein. Some miscellaneous types were also ascertained.

Conclusions: Different types of anatomic variations may adversely affect the course of surgery and interventional radiological procedures. Fortunately, radiologists can now discover the critical types by using the new generation multidetector computed tomography with 3-dimensional reconstruction techniques. This information should be included in the radiology reports of patients who are scheduled for major surgery.