Lymphangioleioma is a benign congenital tumor consisting of dilated lymphatic vessels with endothelial cell proliferation and connective tissue, containing lymphatic fluid, lymphocytes or mixed with blood. They are classified as capillary lymphangioleioma, cavernous lymphangioleioma, and cystic lymphangioleioma, depending on the size of the lymphatic vessels that make up the tissue. Clinical symptoms of lymphangioleioma Spongiform lymphangioleioma is the most common type of lymphangioleioma and can be small or large, even invading a limb. The lesions are ill-defined, spongy subcutaneous tissue masses or diffuse swellings that are soft and hard like a lipoma. Unless there is an associated hemangioma, there is usually no surface color change. The symptoms of this type of lymphatic hemangioma increase in size with the age of the infant and progress to deeper tissues. What are the dangers of lymphangioangioma? Prone to infection: Infection may adhere to the surrounding tissues, making the boundary between the tumor and the thickened skin on the surface unclear and making treatment more difficult. Damage to appearance: Lymphangiectasia located in the cheek can cause serious damage to the appearance of children. For example, if the tumor grows on the lips, it may cause giant lips, and if it grows on the tongue, it may cause giant tongue, which may affect speech and eating. Disability: Lymphangioangioma located in the extremities can cause deformity, limpness or even disability.