Lymphangiomas in the mediastinum are rare beningn tumors, characterized by proliferating lymphatic vessels. They are usually found in children and young adults, but rarely in older adults. Most are located in the neck, with less than 1 percent found in the mediastinum, with mediastinal lymphangiomas comprising 0.7-4.5 percent of all tumors in this location. They are often classified pathologically according to the size of the cystic spaces within them, as simple or capillary, cavernous and cystic, or just cystic, hygromas, Of the 3 types above, the cavernous type of mediastinal lymphangioma is very rare.