This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
Swirl sign is associated with 
Select and explain. 
A. Subdural hematoma, B. Epidural hematoma, C. Subarachnoid hematoma, D. Acute bleed
B: Epidural hematoma
Answer: B: Epidural hematoma 
Explanation: Swirl sign is a hypodense area noted within a hyperdense Epidural hematoma suggestive of active bleeding, a hyperacute unclotted blood.