MCQ 34 Vasodilation in spider naevi is due to:

A.Hepatotoxin
B.Estrogen
C.Testosterone
D.DHEA

The correct answer is B.Estrogen


Note: Spider naevi refers to dilated visible small blood vessels in the skin.It is called spider naevi because it consists of central 'feeding' blood vessels with numerous fine radiating legs emanating from the central body.

Spider angiomas are only found in the distribution of Superior Vena Cava like on the face,trunk,upper part of the neck,arms.
It occurs due to estrogen excess.So in many pregnant women or women on hormonal contraception have spider naevi.Many patient with severe hepatic disease also show spider naevi as the diseased liver cannot detoxify estrogen.Commonly found in cirrhosis of liver (33%).



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