Orbital lymphangioma

Lymphangioma (lymphangioma) is a hamartoma composed of lymphatic vessels that may be caused by developmental abnormalities, because the orbits do not contain lymphatic vessels lined with endothelial cells. Intermittent eyeball prolapse may be a clinical feature of lymphangioma. Spontaneous bleeding caused by rupture of blood vessels in the tumor stroma due to various reasons can cause sudden exacerbation of the eyeball; for example, when the bleeding time is long and it enters the lymphatic vessels Old hematoma, clinically known as "chocolate cyst". The exacerbation of eyeballs during or after an upper respiratory tract viral infection is due to the proliferation of lymphoid tissue in the stroma of the lesion. In histopathology, a tumor consists of a lumen that is dilated and filled with lymph fluid and a wall with a single layer of endothelial cells. The lesions were cystic or honeycomb. If mixed with both venous and lymphatic components, it is called "angioma" pathologically, which is far less common than hemangioma.