But there was a sharp rise in brain mass.

They took out the brain mass, and the chances are, it's benign.

Moreover, there is a statistical correlation between brain mass or size and intelligence in human beings.

But might there not be some rough and approximate way in which to connect brain mass with intelligence?

With less body to control, might not a smaller brain mass be adequate?

For a given body mass or weight, mammals have consistently higher brain mass.

Example: how does brain mass vary in relation to body mass?

During this time, however, the brain mass hardly changes (less than 2% on average).

Increase my skull size and brain mass by 25%!

He suffered severe head trauma and loss of brain mass.