MCQs - Globe and orbit

Question 1

1 .The orbital fissure and optic canal form the caudal part of the orbit. In which bone are they found?

a. Palatine bone
b. Sphenoid bone
c. Frontal bone
d. Sphenopalatine bone

Answer 1

1 .The orbital fissure and optic canal form the caudal part of the orbit. In which bone are they found?

b.Sphenoid bone

Question 2

Which one of the following structures is located within the orbital cone (ie is an intraconal structure)?

a. Maxillary artery
b. Zygomatic salivary gland
c. Cranial nerve V (trigeminal) - ophthalmic branch
d. Base of the nictitans membrane

Answer 2

Which one of the following structures is located within the orbital cone (ie is an intraconal structure)?

c.Cranial nerve V (trigeminal) - ophthalmic branch

The correct answer is: Cranial nerve V (trigeminal) - ophthalmic branch
Correct

Question 3

Question 3
Regarding the condition ‘bilateral extraocular myositis’, which is the most accurate statement?

a. Treatment consists of oral NSAIDs until clinical signs resolve
b. Patients will have reduced to absent physiological nystagmus (reduced oculovestibular movements)
c. This type of myositis is most commonly seen in elderly male dogs
d. Patients will have elevated 2M antibodies

Answer 3

Question 3
Regarding the condition ‘bilateral extraocular myositis’, which is the most accurate statement?

b.Patients will have reduced to absent physiological nystagmus (reduced oculovestibular movements)

The correct answer is: Patients will have reduced to absent physiological nystagmus (reduced oculovestibular movements)

Question 4

Which of the following prognostic factors is a good indicator of the viability of the globe in a patient with proptosis?

a. Absence of any extraocular muscle avulsion or rupture
b. Presence of a menace response and dazzle reflex
c. Non-brachycepahlic conformation
d. The pupil size - if miotic it is likely that the globe will be functional

Answer 4

Which of the following prognostic factors is a good indicator of the viability of the globe in a patient with proptosis?

a.Absence of any extraocular muscle avulsion or rupture

Well done. Prognosis depends on several factors but if two or more extraocular muscles are torn, the vascular integrity of the globe will be severely compromised.

Question 5

Primary orbital tumours in small animal patients tend to be

a. Malignant, highly locally invasive and with a low metastatic rate
b. Benign and surgical excision tends to be curative
c. Malignant, with low local invasiveness but a high metastatic rate
d. Malignant, with low local invasiveness and a low metastatic rate

Answer 5

Primary orbital tumours in small animal patients tend to be

a. Malignant, highly locally invasive and with a low metastatic rate