There is no single causation factor for a benign tumour which fits everybody. There are no absolute causation factors and I'm not looking for an absolute proof of a single causation here.
Just because non sporting people get benign tumours without having played sports, does not lessen the value of considered opinion and supporting evidence that people who have played sports where repeated blows to the head and/or concussion are experienced, have an increased susceptibility factor for brain degeneration to develop later on in life, whatever form that degeneration eventually takes. As Cas states, he feels he left it too long to get his brain examined. I guess here, that he had experienced some symptoms but ignored them. Whether the blows to the head was his main causation factor or not, is not of great relevance to Cas right now but his sports career put him in a risk category which by default should be actively encouraged (by footballers' union?) to undergo regular check ups.
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