Orbit 3

Question 1

What percentage of infants have NLDO at birth?

Answer 1

50%

Question 2

What is the most common site of orbital lymphoma presentation?

Answer 2

Lacrimal fossa

Question 3

What are optocilliary shunt vessels?

Answer 3

Retinal venous outflow through the central retinal vein has increased resistance and so collateral expand. Those are the optocilliary shunt vessels which drain from the peripapillary region to the choroid

Question 4

What type of tumor can cause optocilliary shunt vessels?

Answer 4

Optic sheath meningioma

Question 5

What is the most common cause of NLDO in adults?

Answer 5

Involutional stenosis

Question 6

Jones 1 test

Answer 6

Fluorescein instilled and CTA to inferior meatus to observe any dye

Question 7

Jones 2

Answer 7

Done after Jones 1. Previously applied fluorescein is washed out of eye. NS irrigated to drainage system. Fluid is collected from inferior meatus and observed to see if dye is there. Means dye originally got into they lacrimal outflow system but could not get out.

Question 8

Conjunctival DCR begins and ends where?

Answer 8

Caruncle to medial meatus

Question 9

Retinal astrocytomas are most commonly associated with what phacomycoses?

Answer 9

Tuberous sclerosis

Question 10

What percentage of patients will have epiphora with only one functioning punctum?

Answer 10

50%; the 50% will have constant or intermittant epiphora

Question 11

Is a dermoid cyst a choristima or hamartoma?

Answer 11

Choristoma. Other choristomas include epidermoid cysts, dermolipomas, and teratomas

Question 12

For necrotizing faciitis, which abx is particularly useful bc of its unique effectiveness against toxins produced by group a strep.

Answer 12

Clindamycin

Question 13

AVM’s (arterial venous malformations) are high flow or low flow

Answer 13

High flow

Question 14

Optic nerve gliomas are most frequently associated with what disease?

Answer 14

Neurofibromatosis type 1

Question 15

What percentage of patient’s with Wegener’s granulomatosis have associated scleritis?

Answer 15

25%

Question 16

Rounding of the medial canthal tendon is concerning for what? Particularly in facial trauma.

Answer 16

Avulsion of the medial canthal tendon, this can be seen in NOE fractures (type III)

Question 17

Is it safe to perform MRI in a patient with a intra orbital BB?

Answer 17

yes

Question 18

What is the most common type of eyelid malignancy?

Answer 18

basal cell carcinoma

Question 19

Quickert suturs are used to repair ectropion or entropion?

Answer 19

Entropion