What could cause someone to fail a medical exam for boxing?

[ZroC]

I'm seeing this article about Iain Weaver failing a med exam due to an apparent cyst on his brain even though he was cleared by two examiners.
http://www.bbc.co.uk/sport/0/boxing/21147215

Now I'm curious, aside from serious things like brain injury what other things can cause them to reject you? As I understand it medical exams like these are usually pretty lax. I know some guys who are over 30 coming off back injuries who get the nod. Do you need to pass all the tests or only a few? Say you pass everything but your eyesight isn't really up to scratch, can you be rejected? And does everyone get X-Ray and MRI scans or are they only for prospects and the like? If not why does Weaver here get an MRI scan while the average Joe just gets a short check up in the doctor's office?

 

[Sunfish]

In which jurisdiction? Australia licensed Paul Briggs so I assume they have different standards to the uk.

 

[Seano]

He'll be able to fight in some places until he proves he won't die from getting hit in the head. Like the Edwin Valero situation before we realized what a kook he was. Any place with a serious commission won't touch that kid. He has shit wrong with his brain, I don't even see why its a question.

 

[mozfonky]

All depends on the physician and who the client is. Ali should never have been cleared for holmes but the big money made it happen. Holyfield had the "hole in his heart" but was cleared for every post-moorer1 fight, if there wasn't the money at stake who's to say how big of a hassle it would have been. Anything from a heart murmur, vision, heartrate and blood pressure(remember the first liston fight) can put a halt to a fight. Ethics is only a part of it though. Money talks big time.