A radiograph of a parietoacanthial transoral (open-mouth Waters) projection reveals that the mouth is open but the sphenoid sinus is superimposed over the maxilla and upper teeth.What positioning error led to this radiographic outcome?
A) Insufficient flexion of the head and neck
B) Excessive CR angulation
C) Insufficient CR angulation
D) Insufficient extension of the head and neck
Correct Answer:
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