These look like pseudomembranes. Those take time to form. If it was an old injury it wouldn't have caused the coma.
Bleeding around his brain caused pressure inside his head which caused the coma.
MRI showed a subdural hematoma.
MRI showed a subdural hematoma. [SEP] Bleeding around his brain caused pressure inside his head which caused the coma. [SEP] These look like pseudomembranes. Those take time to form. If it was an old injury it wouldn't have caused the coma.