Test 15  (optic discs) 

 

Refer to this picture for question 1, 2 & 3

1. The following conditions are associated with the picture above:

a. pseudoxanthoma elasticum

b. retinitis pigmentosa

c. age-related macular degeneration

d. retinal detachment

e. retinoschisis

Answera.T   b.T  c.F  d.F  e.F

It is also associated angioid streaks.

2. The following are true:

a. the lesions are situated within the myelinated part of 
    the optic disc

b. they occur more commonly in patients with small discs

c. they can be inherited as a autosomal recessive trait

d. ultrasound is useful for diagnosis

e. MRI is useful for diagnosis.

Answera.F   b.T   c.F   d.T  e.F
Optic disc drusen is usually situated anterior to the myelinated part of the optic nerve.
In some patients, it is inherited as autosomal dominant fashion with variable penetrance.
Ultrasound and CT scan can be used to demonstrate calcification of the optic nerve head. MRI does not demonstrate calcification well.

3. Visual loss can result from

a. optic atrophy

b. retinal detachment

c. papilloedema

d. venous occlusion

e. peripapillary choroidal neovascularization.

Answera.T   b.F  c.F  d.T  e.T
Possible causes of reduced vision in optic disc drusen include:
optic atrophy
venous occlusion
ischaemic optic neuropathy
peripapillary choroidal neovascularization.

 

Refer to the picture above for question 4.

4. Ocular association include:

a. lens coloboma

b. foveal hypoplasia

c. serous macular detachment

d. aniridia

e. persistent hyperplastic primary vitreous

Answera.T   b.T  c.T   d.T  e.T
Morning glory anomaly is characterized by large 
disc containing a central core of white tissue. Blood 
vessels emerge from the edge of the disc in a spoke-like 
features. The area around the disc shows chorioretinal pigmentary changes.

 

Refer to the picture above for question 5

5. Conditions associated with the picture include :

a. trisomy 22

b. trisomy 21

c. trisomy 18

d. trisomy 13

e. Turner's syndrome

Answera.T   b.F  c.T   d.T  e.F
Chromosomal abnormalities associated with optic disc coloboma include:
Patau's syndrome (trisomy 13)
Edward's syndrome (trisomy 18)
Cat-eye syndrome (trisomy 22)

 
 

More MCQs