This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain Imaging: Inflammatory, Infectious, and Vascular Diseases, Subject name: Radiology
Hummingbird sign on MRI is seen in - 
Select and explain. 
A. Multisystem atrophy, B. Lewy body dementia, C. Progressive supranuclear palsy, D. Alzeihmer's disease
C: Progressive supranuclear palsy
Answer: C: Progressive supranuclear palsy 
Explanation: Ans. is 'c' i.e., Progressive supranuclear palsy o Hummingbird sign and Mickey Mouse sign are seen on MRI in progressive supranuclear palsy,o In progressive supranuclear palsy (PSP), severe mesencephalic atrophy occurs, giving the appearance of a hummingbird on mid-sagittal images.