“...it is absolutely clear, there are haemorrhages present behind both eyes” and he went on to state that it would be “hearing hoofs and thinking unicorns to think of anything else”
“In my opinion, an injury mechanism involving rapid stroke repetitive acceleration - deceleration forces, such as a shaking type injury, is more likely than an impact mechanism to explain this constellation of injuries. The accidental fall from the bed is unlikely to fully explain M’s injuries. It is possible that a fall from the bed caused some acute subdural bleeding in the context of established subdural collections caused by an earlier episode of trauma. In my opinion, in the absence of any underlying bleeding or metabolic disorder, M was likely subject to an episode of non-accidental injury. The presence of bilateral haemorrhages raises the suspicion of non-accidental injury.”
“Re-bleeds into already established chronic subdural collections are known to occur with minimal force following trivial trauma. It is possible therefore that if M had established subdural collections at the time of the fall from the bed he was predisposed to an acute bleed.”
“The causes of M’s injuries should depend on the causation of his intracranial haemorrhage and brain injuries. A fall as the cause of the retinal haemorrhages cannot be completely ruled out but neither can non-accidental injury be ruled out simply by the presence of retinal haemorrhages”
“Arachnoid cysts can also rupture causing cerebrospinal fluid [CSF] to leak into the subdural space causing a subdural hygroma. Again, this is rare and when it occurs it is usually on the same side of the cyst although bilateral hygromas can occur. My impression of subtle expansion of the middle fossa disproportionate to the size of the cyst is supportive of cyst rupture. The growth in the arachnoid cyst suggests that it is accumulating CSF. Arachnoid cysts can grow over time due to trapping of CSF that can flow in but cannot flow out or due to the production of CSF by the cyst membrane. Most arachnoid cysts do not grow but some do.”
“As M's arachnoid cyst has grown and is large on the December 2022 MRI, I add more weight to its possible contribution to the subdural collections than placed in my original report. In my opinion it is possible that subdural collections [hygromas] were caused through rupture of the arachnoid cyst following trivial trauma, which then predisposed M to a subdural bleed from the bed fall.”
“So I do still remain somewhat uncomfortable with a short fall producing that diffuse haemorrhage, but ultimately it’s an unknown.”
“My preferred explanation for M’s clinical presentation is a recent episode of trauma shortly before his presentation that caused apnoea, a possible seizure, and fluctuating conscious level, and an earlier event several days [or longer] prior to his presentation that caused subdural collections, raised intra cranial pressure and vomiting. Possible recent trauma includes the bed fall or an episode of non-accidental injury. Possible causes of the earlier event that caused subdural collections include rupture of the arachnoid cyst from trivial trauma or an episode of non-accidental injury. In my opinion there are no features of M’s clinical presentation in hospital or radiology that distinguish these hypotheses.”
“I am comfortable with accepting the short fall from the bed, in the context of there being subdural hygromas and an arachnoid cyst, as an explanation for the findings on scans. I see no particular reason to favour inflicted injury on the basis of what is shown on the scans.”
“The appearance most probably represent focal brain laceration.”