Final answer:
The term 'closed cisterns' does not specifically imply a type of brain injury. It likely refers to the normal anatomical spaces in the brain where cerebrospinal fluid (CSF) is contained.
Step-by-step explanation:
The term 'closed cisterns' does not specifically imply a type of brain injury. The term 'cisterns' refers to certain spaces within the brain where cerebrospinal fluid (CSF) is located. 'Closed cisterns' likely refers to the normal anatomical spaces in the brain where CSF is contained, as opposed to 'open cisterns' which can indicate leakage of CSF due to a skull fracture or tear in the protective membranes surrounding the brain.