Key legal question
Whether the headaches reported in the 2008 relapse were causally linked to the 1998 accident so as to justify accident insurance benefits
Extracted holding
The required degree of probability for a natural causal link was not established.
Extracted reasoning
The court relied on the judicial neurological expert report, which found primary headaches more probable than post-traumatic headaches and no convincing counter-evidence justifying departure from the expert conclusions.