Test 78    (Ocular anatomy)

1. The following are true about squamous cell carcinoma:

a. it is a commoner malignant skin tumour than basal cell 
    carcinoma
b. it only occurs in the skin
c. it is the most common skin tumour seen in transplant 
    patient
d. metastasis is usually to the regional lymph nodes
e. the tumour typically have everted edges

Answera.F   b.F  c.T   d.T   e.T
Basal cell carcinoma is the most common
malignant skin tumour. Squamous cell
carcinoma can occur in other organs such
as the lungs and bladder. 

2. Features of a sebaceous cyst include:

a. it arises in the dermis
b. a central punctum is a common feature
c. scalp is a common location
d. it is firmly adherent to the skin
e. it contains mucopolysaccharides.

Answera.T   b.T   c.T   d.F   e.F
Skin can usually move over the 
cyst easily. The cyst contains sebum.

3. Features of a dermoid cyst:

a. if found in the orbital region is usually located in the 
    medial angle of the eye
b. it is lined by squamous epithelium
c. hair may be found in the cyst
d. most cases are congenital
e. rupture of the cyst is associated with foreign body type 
    inflammation

Answera.F   b.T   c.T   d.T   e.T
In the orbital region, the cyst is found 
mainly in the lateral angle of the eye.

4. The following are true about aneurysm:

a. a true aneurysm is covered by all three layers of the 
    vessel
b. dissecting aneurysm results from destruction of the 
    vessel media layer
c. hypertension is associated with formation of true 
    aneurysm
d. berry aneurysm is associated with 
    hypercholesterolaemia
e. a internal carotid aneurysm in the cavernous sinus
    can give rise to ipsilateral miosis

Answera.T  b.T  c.T   d.F   e.T
berry aneurysm is typically found in the
circle of Willis and is a congenital disorder.
Ipsilateral sixth nerve palsy and Horner's 
syndrome may be the first sign of a internal
carotid artery aneurysm in the cavernous sinus.

5. The following are true about malignant melanoma:

a. it is commoner in females than males
b. amelanotic type is more aggressive than pigmented type
c. malignant transformation in common moles is about 
    1:10,000
d. staging is according to the size of the tumour
e. it is found exclusively in the skin

Answera.F    b.T   c.F   d.F  e.F
The ratio of female to male is about 1:2.
The rate of malignant transformation in 
common moles is about 1:100,000.
Staging is according to the depth of the 
tumour (Breslow's classification).

 
 

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