A radiograph of a parietoacanthial (Waters method) projection reveals that the petrous ridges are superimposed over the lower 30% of the maxillary sinuses.What specific positioning error (if any) led to this radiographic finding?
A) Insufficient extension of skull and neck
B) Excessive extension of skull and neck
C) Excessive CR angulation
D) No error exists; accept the initial radiograph.
Correct Answer:
Verified
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