Final answer:
The percentage of the population with accessory spleen is estimated to be around 10-30%. An accessory spleen is a small, extra spleen that does not typically cause any health problems.
Step-by-step explanation:
The percentage of the population with accessory spleen is not well-documented, but it is estimated to be around 10-30%. An accessory spleen is a small, extra spleen that is found in addition to the normal spleen. It is usually asymptomatic and does not typically cause any health problems.