Capillary lymphangiomas Capillary lymphangiomas are composed of small, capillary-sized lymphatic vessels and are characteristically located in the epidermis. Cavernous lymphangiomas Composed of dilated lymphatic channels, cavernous lymphangiomas characteristically invade surrounding tissues. Cystic hygromas Cystic hygromas are large, macrocystic lymphangiomas filled with straw-colored, protein-rich fluid. Hemangiolymphangioma As suggested by their name, hemangiolymphangiomas are lymphangiomas with a vascular component. Lymphangiomas may also be classified into microcystic, macrocystic, and mixed subtypes, according to the size of their cysts. Microcystic lymphangiomas Microcystic lymphangiomas are composed of cysts, each of which measures less than 2 cm3 in volume. Macrocystic lymphangiomas Macrocystic lymphangiomas contain cysts measuring more than 2 cm3 in volume. Mixed lymphangiomas Lymphangiomas of the mixed type contain both microcystic and macrocystic components. Finally, lymphangiomas may be described in stages, which vary by location and extent of disease. In particular, stage depends on whether lymphangiomas are present above or superior to the hyoid bone (suprahyoid), below or inferior to the hyoid bone (infrahyoid), and whether the lymphangiomas are on one side of the body (unilateral) or both (bilateral). Stage I Unilateral infrahyoid. Stage II Unilateral suprahyoid. Stage III Unilateral suprahyoid and infrahyoid. Stage IV Bilateral suprahyoid. Stage V Bilateral suprahyoid and infrahyoid. Treatment Treatment for cystic hygroma involves the removal of the abnormal tissue; however complete removal may be impossible without removing other normal areas. Surgical removal of the tumor is the typical treatment provided, with the understanding that additional removal procedures will most likely be required as the lymphangioma grows. Most patients need at least two procedures done for the removal process to be achieved. Recurrence is possible but unlikely for those lesions able to be removed completely via excisional surgery. Radiotherapy and chemical cauteries are not as effective with the lymphangioma than they are with the hemangioma. Draining lymphangiomas of fluid provides only temporary relief, so they are removed surgically. Cystic Hygroma can be treated with OK432 (Picibanil). The least invasive and most effective form of treatment is now performed by interventional radiologists. A sclerosing agent, such as 1% or 3% sodium tetradecyl sulfate, doxycycline, or ethanol, may be directly injected into a lymphocele. "All sclerosing agents are thought to work by ablating the endothelial cells of the disrupted lymphatics feeding into the lymphocele." Lymphangioma circumscription can be healed when treated with a flashlamp pulsed dye laser, although this can cause port-wine stains and other vascular lesions. Orbital lymphangiomas, which carry significant