Spider naevus Health Dictionary

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Spider Naevus: From 2 Different Sources

A red, raised pinheadsized dot, from which small blood vessels radiate, due to a dilated minor artery and its connecting capillaries. Small numbers of spider naevi are common in children and pregnant women, but in larger numbers, they may indicate liver disease. (See also telangiectasia.)
Health Source: BMA Medical Dictionary
Author: The British Medical Association
a dilated arteriole forming a red papule from which radiate prominent capillaries, so that it resembles a spider. Excessive numbers of spider naevi are a sign of liver cirrhosis, hepatitis, thyrotoxicosis, and rheumatoid arthritis; they are also a feature of normal pregnancy. See also telangiectasis.
Health Source: Oxford | Concise Colour Medical Dictionary
Author: Jonathan Law, Elizabeth Martin

Naevus

A congenitally determined tissue abnormality. In the SKIN, naevi of blood vessels are best known, but a MOLE is a MELANOCYTE naevus, and warty streaked and linear naevi of the epidermis occasionally occur. There are several patterns of vascular naevi:

Naevus simplex Also known as ‘salmon patch’. About one-third of white children are born with macular pink areas of ERYTHEMA on the nape, brow or eyelids which usually disappear after a few months, but patches on the nape may persist.

Naevus ?ammeus Also known as ‘portwine stain’ and present at birth. It is unilateral, usually on the face, and may be extensive. It tends to darken with age and is permanent. Laser treatment is e?ective.

Strawberry naevus (cavernous haemangioma) is usually not present at birth but appears within a few weeks and grows rapidly, reaching a peak in size after 6–12 months, when the lobulated red nodule may resemble a ripe strawberry. Untreated, the naevus disappears spontaneously over several years. It may occur anywhere and may be very troublesome when occurring around an eye or on the ‘nappy’ area. If possible it should be left alone, but where it is causing problems other than simply cosmetic ones it is best treated by an expert. This may involve medical treatment with steroids or interferon or laser therapy.

Spider naevus is due to a dilated ARTERIOLE causing a minute red papule in the skin, the small branching vessels resembling spider legs. A few spider naevi are common in young people, but multiple naevi are common in pregnancy and may also be a warning sign of chronic liver disease.... naevus

Button Spider

A South African spider similar to the Redback spider of Australia and the Black Widow spider of America. Belongs to the species Latrodectus indistinctus.... button spider

Red Back Spider

Spider found mostly in Australia and is similar to the Black Widow of America and the Button spider of South Africa. Belongs to the species Latrodectus hasseltii.... red back spider

Spider Bites

Nearly all spiders produce venom, which they use to kill their prey.

However, only a few species, such as the black widow in North America, are harmful to humans.

Antivenoms are available for many dangerous spider bites.... spider bites

Strawberry Naevus

A bright red, raised spot which appears in early infancy. It is a type of haemangioma.... strawberry naevus

Becker’s Naevus

(Becker melanosis)... becker’s naevus

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