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
'Towne's view' in X-ray is used for visualizing the following structure: 
Select and explain. 
A. Cochlea, B. Arcuate eminence, C. Superior semicircular canal, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Towne's view is anteroposterior view with 30o tilt from above and in front. It shows both petrous pyramids which can be compared. Structures seen are, Arcuate eminence and superior semicircular canal Mastoid antrum Internal auditory canal Tympanic cavity Cochlea External auditory canal This view is usually taken for acoustic neuroma, and apical petrositis. Ref: Diseases of Ear, Nose and Throat by PL Dhingra, 4th edition, Page 386.