In my case my head injury was classed as severe due to the subdural haematoma. Any intra cranial bleeding, no matter how benign, causes a head injury to be classed as severe under the CAA guidance.
The guidance material is here :-
https://www.caa.co.uk/Aeromedical-Ex...e-material-GM/
With the head injury material here -
https://www.caa.co.uk/WorkArea/Downl...?id=4294973901 - and here
https://www.caa.co.uk/WorkArea/Downl...?id=4294973700
In my case most of the criteria for my head injury would have classed it as moderate, GC > 9, short LOC etc. However my intracranial haemorrhage instantly put me in the severe category.
Show that guidance material to your consultant, you may need a neurologist as well as the surgeon, and make sure that they are clear on what they must include in the report.
Best of luck.