This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
[{'content': 'A male was brought unconscious to the hospital with external injuries. CT brain showed no midline shift, but basal cisterns were compressed with multiple small hemorrhages. What is the diagnosis – \nSelect and explain. \nA. Cortical contusion, B. Cerebral laceration, C. Multiple infarcts, D. Diffuse axonal injuries', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Diffuse axonal injury (DAI) and Cerebral contusions are the most common primary brain injuries in non-penetrating trauma to head, comprising almost 95% of primary injuries.\nDiffuse axonal injury\n\n(the most common primary brain injury), there is a shearing injury of axons most commonly at the cortico-medullary junction, due to sudden acceleration/deacceleration or rotational forces on the brain.\nThese shearing injuries tend to be diffuse & bilateral.\nDAI is seen in cases of severe head injury and the patient loses consciousness at the moment of impact.\n\nCortical contusions\n\nAre foci of hemorrhages, that occur because of brain hitting against the bony ridges of the skull and less often the dual fold.\nCompared to DAI, cortical contusion are less frequently associated with the initial loss of consciousness unless they are extensive.\n\nThe above-given patient. presents a picture of.DAI. He is unconscious. His CT shows multiple small hemorrhages. There is no midline shift as the injuries are diffuse & bilateral. Basal cisterns are compressed due to diffuse cerebral edema', 'role': 'assistant'}]