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General Lymphangioma
Lymphangioma, a lymphatic malformation, is a benign proliferation of lymph vessels, or a yellow-ish tumor on the skin, composed of a mass of dilated lymph vessels. It is often removed by surgery or a form of surgery using an electric current(electrocoagulation) for cosmetic reasons. It is rare, incidence estimated to be around 1 in every 10,000 live births. They are fluid filled sacs that result from blockage of the lymphatic system. They are often associated with karyotype abnormalities such as Turner syndrome. These tumors may occur anywhere but usually occur in the head and neck (75%), with a predilection for the left side. Most (90%) are either evident at birth or become evident before age 2 years. Other types of Lymphangioma are Cystic lymphangioma, Lymphangioma cavernosum and Lymphangioma circumscriptum.

Information on the Types of Lymphangioma
Lymphangioma circumscriptum - Also referred to as cutaneous this is a "kind" of birthmark generally occurring in clusters. They resemble small blisters and range in color from pink to dark red. They are benign and usually require no medical treatment. For cosmetic reasons, some patients may choose to have them surgically removed. Lymphangiomas Simplex is often included in this type.This is also a type of tumor that is commonly seen in younger children.

Cavernous lymphangioma - This is an uncommon form generally arising during infancy. These are deep seated underneath the dermis and the external skin is not involved. Because they are deep seated, they form a bulging mass, painless mass. This is also a tumor filled with lymph that is often mixed with blood. It usually affects the tongue and lips.

Cystic Hygroma - These are soft lymph filled masses within a thin-walled "sac" generally appearing on the neck (75%), arm pit or groin areas. They usually present a swollen bulges underneath the skin. While they generally present at birth, children up to three years old may experience them. There is also disagreement on whether this type is distinctly different enough from cavernous lymphangioma to be classified separately.

Lymph Nodes
One of many small oval structures that filter the lymph, fight infection and in which there are formed white blood cells and blood plasma cells. They come in various sizes, they can range from being as small as a pin head or as big as a bean. Each node is enclosed in a fiberous capsule and consist of closely packed white cells(lymphocytes) connected tissue and lymph path ways.
 * A Lymph is a clear, watery, sometimes faintly yellowish fluid derived from body tissues that contains white blood cells and circulates throughout the lymphatic system, returning to the venous bloodstream through the thoracic duct. Lymph acts to remove bacteria and certain proteins from the tissues, transport fat from the small intestine, and supply mature lymphocytes to the blood.

Causes
There is no known cause for these lymphatic abnormalities.

The tumor is a hamartoma or vascular developmental anomaly arising from lymphatic vessels, manifesting as a raised, soft, shaggy, bubbly, pinkish-white lesion; cosmetic considerations may warrant attempted removal of lymphangiomas.

Resources
1.)http://dictionary.reference.com/browse/lymph

2.)Medical Dictionary

3.)http://www.wrongdiagnosis.com/l/lymphangiomas/basics.htm

4.)