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Explanation: I think this means a head injury, such as a concussion, in which the skull is not broken or fractured. I think the term is closed head injury.
(I say I think because I am not a doctor, nor am I an expert in this field.)
Explanation: head injuries, closed
Organic or functional damage resulting from trauma to the head where continuity of the scalp and mucous membranes is
maintained. When brain injury results from closed head injuries, the primary cause is mechanical stretching and shearing of nerve fibers. Also common are focal intracranial lesions including haematomas and contusions.
lésion cérébrale: i.e. affectant le cerveau (donc "interne")
ou encore: traumatisme crânien interne (mais pas ma préférence)