Excessive Paranasal Sinuses and Mastoid Aeration as a Possible Cause of Chronic Headache
(a) Linear measurements of frontal sinus in the axial plane (RL: anteroposterior length of the right sinus and LL: anteroposterior length of the left sinus). (b) Area calculation of the sphenoid sinuses and the mastoid air cells in the axial plane.
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