Which of the following could substitute the AP axial Townes if the patient was unable to assume that position?
PA axial Caldwell
AP axial Townes
PA axial Haas
Water's method
PA axial Haas
Rationale: The PA axial Haas method is a reversal of the AP axial Townes. It is the least preferred method because of the OID between the occipital bone and the IR. If this method were to be substituted, the patient is aligned with OML and MSP perpendicular like a PA. A 25 degree cephalic tube angle is applied to enter the external occipital protuberance and will exit approximately the hairline.
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