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Dermatology Gastroenterology What is your spot diagnosis ?

What is your spot diagnosis ?

image1.What is your diagnosis ?
a. Addison's disease
b. Erythema marginatum
c. type i hypersensitivity reaction
d. Neurofibromatosis
e. Spider angioma
2. Name one aetiology for this condition  ?
 
 
 
Correct Answers
 

Spider naevi are telangiectases that consist of a large arteriole from which radiate numerous small vessels that resemble, in the mind's eye, spider's legs.

They are found in the distribution of the superior vena cava i.e. on the arms, neck, and chest wall.

They vary in size from barely visible to more than half a centimetre in diameter. Occasionally, they bleed profusely.

Pressure applied with a pointed object to the central arteriole causes blanching of the whole lesion. Pressure applied through a transparent glass object may illustrate pulsatile blood flow.

The finding of more than two spider naevi is abnormal.

Why they occur only in the upper part of the body is uncertain.

 

Causes of spider naevi include:

  • cirrhosis - most frequently, alcoholic
  • oestrogen excess - usually in association with chronic liver disease; part of normal hepatic function is the inactivation of oestrogens
  • hyperthyroidism
  • rheumatoid arthritis - rarely
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