ABO Oculoplastic & Orbit 2

Question 1

Which extraocular muscle is most commonly enlarged in thyroid eye disease?

Accepted Answer

Inferior rectus

Answer

The inferior rectus is most frequently involved, followed by the medial, superior, and lateral recti.

Question 2

On orbital CT, enlargement of an extraocular muscle that includes the tendon insertion is most characteristic of which condition?

Accepted Answer

Idiopathic orbital myositis

Answer

Orbital myositis typically involves the tendon, whereas thyroid eye disease classically spares it.

Question 3

What is the most common benign orbital mass in adults?

Accepted Answer

Cavernous venous malformation (cavernous hemangioma)

Answer

Cavernous venous malformation is the most common benign orbital lesion in adults, typically a well-circumscribed intraconal mass in middle-aged women.

Question 4

A 7-year-old presents with rapidly progressive unilateral proptosis and superior orbital mass over 2 weeks. What is the most likely primary orbital malignancy?

Accepted Answer

Rhabdomyosarcoma

Answer

Rhabdomyosarcoma is the most common primary orbital malignancy of childhood and often presents with rapid proptosis, frequently superonasally.

Question 5

What is the current first-line systemic treatment for a periocular infantile hemangioma causing amblyopia risk?

Accepted Answer

Oral propranolol

Answer

Oral propranolol has replaced corticosteroids as first-line systemic therapy for vision-threatening infantile hemangiomas.

ABO - American Board of Ophthalmology Practice Test

ABO - American Board of Ophthalmology Practice Test

ABO Oculoplastic & Orbit 2