Lymphangiomas are benign congenital abnormalities of the lymphatic system. They are thought to arise from sequestrations of embryonic lymph sacs; these sacs are found in the neck and retroperitoneum. 75% of lymphangiomas occur in the neck. The abnormal ducts vary in size from microscopic to several centimeters and there is a variable component of fibrous adventitia. The large cystic lesions are also known as cystic hygromas. These lesions are commonly discovered as painless masses in otherwise healthy children under the age of two2.
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