My Son Had A Clash Of Heads He Suffered A

my son had a clash of heads he suffered a fractured skull and a bleed on the brain ,we have had aletter back from the hospital after he had a ct scan and a mri scan ,he is now back at football ,but his letter says there is still a faint line there ,there is a little area of gliosis and encephalomalacia could you explain if this is dangerous and is he ok to carry on with his football