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Flashcards in Orbits Deck (22):
1

Modality used to evaluate orbits

CT scan

2

Space defined as being outside the cone formed by the extraocular muscles

Extraconal space

3

Space defined as being inside the cone formed by the extraocular muscles

Intraconal space

4

Retinoblastoma is clinically presented as?

Leukokoria

5

Most common tumor of globe in childhood

Retinoblastoma

6

Most common cause of orbital calcification

Intraocular mass with calcifications

7

Types of retinablastoma based on number globes affected with other sites affected

Unilateral -75%
Bilateral -25%
Trilateral= bilateral + pinealoma
Quadrilateral= bilateral + pinealoma + 4th focus in suprasellar cistern

8

It is typical for retinablastoma

Orbital calcification

9

Primary orbital bone tumor that makes up 0.6-2.0% of all tumors of the orbit

Osteosarcoma of the orbit

10

It is an example of extraconal lesion

Osteosarcoma of the orbit

11

This can be seen on CT scan associated with aggressively occurring lesion

Sunburst appearance

12

Also known as end-stage eye. It is usually a result of several ocular insults

Phthisis bulbi

13

In the elderly population, phthisis bulbi is the most common cause of what?

Intraocular calcification

14

It drains blood from the superior and inferior ophthalmic veins

Cavernous sinus

15

Cavernous sinus is connected to the transverse sinus by what sinus?

Superior petrosal sinus

16

Cavernous sinus is connected to the jugular bulb by what sinus?

Inferior petrosal sinus

17

Pressure in the cavernous sinus is?

0mmHg

18

It is a fistulous connection between the internal carotid artery and cavernous sinus. This is most commonly secondary to trauma resulting to tear in the artery.

Caroticocavernous fistula

19

Pathogenesis of caroticocavernous fistula

Abnormal flow from the high pressure internal carotid artery onto the low pressure cavernous sinus. Because of increased pressure in the sinus, there is a REVERSAL of flow in the OPHTHALMIC VEINS, predominantly in the SUPERIOR OPHTHALMIC VEIN (resulting to proptosis and other clinical symptoms).

20

What is Huber's maneuver?

Vertebral angiogram + carotid artery compression

21

Tool used in conjunction with coil embolization

Sapphire angioplasty balloon

22

Coil used in embolization

Guglielmi detachable coil