C11: Review Questions

Question 1

The width of the dolichocephalic skull is less than ___ of the length.

Answer 1

75%

Question 2

What type of CR angle is required for the axiolateral (Schuller method) for the TMJs?

Answer 2

25- to 30-degree caudad

Question 3

Which skull positioning line is perpendicular to the IR for a superoinferior tangential (axial) projection of the nasal bones?

Answer 3

GAL

Question 4

Which positioning error is present if the mandibular condyles are seen within the petrous portion of the temporal bone on an SMV projection?

Answer 4

insufficient extension

Question 5

How much is the CR angled for an AP axial projection of the mandible if the IOML is perpendicular to the IR?

Answer 5

42 degrees

Question 6

How much must the skull be rotated from a lateral position to best demonstrate the body of the mandible for the axiolateral oblique projection?

Answer 6

30 degrees

Question 7

What is the angle between the MSP and the plane of the IR (from a lateral position) for the parieto-orbital oblique projection for the optic foramen?

Answer 7

53 degrees

Question 8

Which of the following projections would best detect a fracture of the orbital floor?

Answer 8

parietoacanthial projection

Question 9

What is the angle between the OML and the plane of the IR for a well-positioned parietoacanthial projection?

Answer 9

37 degrees

Question 10

Which projection of the skull will best demonstrate signs of a pituitary adenoma?

Answer 10

lateral

Question 11

A fracture of the floor of the orbit due to a direct strike to the base is termed a:

Answer 11

blowout fracture

Question 12

Which variation of the PA (axial) projection of the skull has been performed if the petrous ridges are at the level of the supraorbital margin?

Answer 12

PA 0 degrees

Question 13

The temporomandibular joints are classified as:

Answer 13

bicondylar and plane

Question 14

Which bones comprise the cranial bones?

Answer 14

frontal, sphenoid, ethmoid, parietal, occipital, and temporal

Question 15

When a fragment of bone is separated and depressed into the cranial cavity, also known as a ping-pong fracture, is termed a:

Answer 15

depressed fracture

Question 16

Which lesions have a “moth-eaten” appearance of bone because of the mix of destructive and blastic lesions?

Answer 16

both osteolytic and osteoblastic

Question 17

Which lesions are destructive lesions with irregular margins?

Answer 17

osteolytic

Question 18

Which lesions are proliferative bony lesions of increased density?

Answer 18

osteoblastic

Question 19

What type of CR angle is recommended for an AP axial projection of the skull?

Answer 19

30-degree caudad to OML, or 37-degree caudad to IOML

Question 20

What type of CR angle is recommended for a superoinferior tangential (axial) projection of the nasal bone?

Answer 20

angle as needed, centered CR to nasion and perpendicular to GAL