LRA-226 Week 3 quiz paranasal sinus and mandible

Question 1

what is the clinical indication for a lateral paranasal sinus?

Answer 1

• inflammatory conditions (sinusitis, secondary osteomyelitis)
• sinus polyp or cysts

Question 2

what is the patient position for a lateral paranasal sinus?

Answer 2

• place face at a true lateral
• align IOML with EAM
• alignment is parallel to the IR
• IPL is perpendicular to IR
• IOML is perpendicular to front edge of the IR

Question 3

what is the CR for a lateral paranasal sinus?

Answer 3

• zygoma
• CR is perpendicular to the IR

Question 4

what anatomy is demonstrated in a lateral paranasal sinus?

Answer 4

• all four paranasal sinuses demonstrated
• no rotation

Question 5

what is the clinical indication for a PA Caldwell paranasal sinuses?

Answer 5

• inflammatory conditions (sinusitis, secondary osteomyelitis)
• sinus polyp or cysts

Question 6

what is the patient position for a PA Caldwell paranasal sinus?

Answer 6

• place patients face toward the IR
• make sure OML is 15 degrees from horizontal (face will look slightly upwards)
• 15 degree sponge can be used in the frontal portion of the head
• center IR to center of nasion

Question 7

what is the CR for a PA Caldwell paranasal sinus?

Answer 7

• CR exits the nasion
• CR is horizontal, parallel to the floor

Question 8

what anatomy is demonstrated in a PA Caldwell paranasal sinus?

Answer 8

• frontal and anterior ethmoid sinus
• petrous ridges in lower one-third of orbits

Question 9

what is the clinical indication for a waters (parietoacanthial) method paranasal sinus?

Answer 9

• inflammatory conditions (sinusitis, secondary osteomyelitis)
• sinus polyp or cysts

Question 10

what is the patient position for a water (parietoacanthial) method paranasal sinus?

Answer 10

• extend the chin, resting the chin against the IR
• align MML to the EAM (37 degrees)
• alignment must be perpendicular to the IR
• MSP perpendicular to midline of the grid

Question 11

what is the CR for a waters (parietoacanthial) method paranasal sinus?

Answer 11

• exit at the acanthion

Question 12

what anatomy is demonstrated in the waters (parietoacanthial) method paranasal sinus?

Answer 12

• unobstructed view of the maxillary sinuses
• petrous ridges just inferior to the maxillary sinuses

Question 13

what is the clinical indication for an SMV paranasal sinus?

Answer 13

• inflammatory conditions (sinusitis, secondary osteomyelitis)
• sinus polyp or cysts

Question 14

what is the patient position for an SMV paranasal sinus?

Answer 14

• hyperextend the chin
• align the IOML with the EAM
• alignment is parallel to the IR

Question 15

what is the CR of a SMV paranasal sinus?

Answer 15

• 1.5-2 inches below the mandibular symphysis
• CR perpendicular to the IR

Question 16

what anatomy is demonstrated in a SMV paranasal sinus?

Answer 16

• unobstructured view of the sphenoid, maxillary, and ethmoid sinuses
• mandibular condyles projected anterior to petrous bone

Question 17

what is the clinical indication for an open mouth waters (parietoacanthial)?

Answer 17

• inflammatory conditions (sinusitis, secondary osteomyelitis)
• sinus polyp or cysts

Question 18

what is the patient position for an open mouth waters (parietoacanthial)?

Answer 18

• extend the chin, resting the chin against the IR
• align MML to the EAM (37 degrees)
• alignment must be perpendicular to the IR
• MSP perpendicular to midline of the grid
• instruct patient to open their mouth

Question 19

what is the CR to an open mouth waters (parietoacanthial)?

Answer 19

• CR is at exit of acanthion
• CR is perpendicular to the IR

Question 20

what anatomy is demonstrated in an open mouth waters (parietoacanthial)?

Answer 20

• maxillary sinuses with the inferior aspect visualized
• alveolar process and petrous ridges free from superimposition
• IOM
• oblique view of the frontal, and sphenoid sinuses