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Hematic cyst

A hematic cyst is a chronic non-neoplastic collection of blood or blood products that persists for some time and exerts a mass effect in the orbit or adjacent tissues. It can result from prior trauma, as a consequence of pre-existing orbital disease, or as a spontaneous event of unknown proximate cause where the acute hematoma fails to completely resorb. In some cases patients may have a bleeding disorder or hypertension. Hematic cysts can form subperiosteally following rupture of arteries traversing from the orbit into adjacent sinuses or cranial cavity. They can also accumulate within lesions such as lymphangiomas, varices, or malignant tumors. The hematic cyst can present at any age. There is usually unilateral proptosis, but pain is not a prominent feature. In half of cases there is a history of orbital trauma that may be months or even years in the past. There may be ocular motility disturbance and visual loss may be seen from dissection of a subperiosteal cyst to the …