This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
Hiatus semilunaris is present in 
Select and explain. 
A. superior meatus, B. Middle meatus, C. Inferior meatus, D. Sphenoethmoidal recess
B: Middle meatus
Answer: B: Middle meatus 
Explanation: Middle meatus: Uncinate process is a hook-like structure running in from anterosuperior to the posteroinferior direction in the middle meatus. It&;s postero superior border is sharp and runs parallel to the anterior border of bulla ethmoidalis. This gap between the two is called hiatus semilunaris .it is two-dimensional space of 1-2 mm width. (Ref: Diseases of Ear, Nose and Throat and head and neck surgery, Dhingra 7th edition, Pg no. 150)