Abstract This was a descriptive cross sectional study carried out in Ribat teaching hospital - Khartoum state - Sudan from January to April 2017, which aimed to estimate of normal main portal vein diameter using Ultrasonography. There were one hundred cases of age ranged from seven to seventy four years, all cases had normal liver, any patient had age eighty years old or had any hepatic and portal vein disorder was excluded from this study. Transabdominal scanning was done for all cases usin...