Skull exam (Mock D)

A radiograph of a parietoacanthial (Waters) projection for sinuses reveals that the petrous pyramids are projected over the maxillary sinuses. What positioning error is present on this radiograph?

Excessive flexion of head and neck

The sella turcica is located on the _____ bone.

sphenoid

Which of the following projections demonstrates the sphenoid sinus?

Parietocanthial transoral; (waters method)

What is the angle between the OML and the plane of the IR for the parietoacanthial (Waters) projection?

37°

The patient is in a prone, oblique position with the midsagittal plane of the head parallel to the IR and the interpupillary line perpendicular to the IR. The CR is directed perpendicular to enter 2 inches superior to the EAM.

What projection of the cranium is demonstrated on the radiograph?

lateral

A radiograph of a parietoacanthial (Waters) projection for sinuses reveals that the petrous pyramids are projected over the maxillary sinuses. What positioning error is present on this radiograph?

Excessive flexion of head and neck

What term is used to identify the angle of the mandible?

Gonion

Which of the following structures passes through the superior orbital fissure?

Cranial nerves III to VI

Which cranial bone is most posterior?

Occipital bone

Which paranasal sinuses are best demonstrated on the PA axial projection (Caldwell method)?

1. Maxillary

2. Frontal

3. Ethmoid

2 and 3 only

Which is the only moveable facial bone?

Mandible

A radiograph of a PA Caldwell (15° caudad) projection for cranium reveals that the petrous ridges are projected into the lower one-third of the orbits. Which of the following modifications should be made during the repeat exposure to produce a more diagnostic image?

Nothing; accept the initial radiograph

A blow-out fracture involves the:

Floor of orbit

Which of the following bones is part of the floor of the cranium?

Occipital

How much difference is there between the OML and IOML positioning lines?

7° to 8°

Which cranial projection best demonstrates the occipital bone?

AP axial (Towne method)

Which of the following cranial bones are paired (right and left)?

1. Frontal

2. Parietal

3. Temporal

2 and 3 only

What is the purpose of performing sinus radiography with the patient in the upright position?

To demonstrate air/fluid levels

Which radiographic baseline is used to position the PA axial projection (Caldwell method) of the cranium?

OML (orbitomeatal line)

What is the name of the articulation between the frontal bone and the parietal bones?

Coronal suture