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No that is faulty logic. A lack of retinal hemorrhage would not rule out trauma to the brain or shaking of an infant as possible cause of injury. If a child had sudden neurological injury then something would have to be the cause. Various modes of investigation may be of help to determine injury to an child. An MRI of the brain may be of help to determine such injury. Determining a head injury would NOT necessarily mean retinal hemorrhage however....
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Anthony Bray MD
Post mortem forsensics is out of my field. I will opt out at this point to allow another expert to reply.