title: Chronic hematic cyst of the orbit.
abstract: A chronic hematic cyst of the orbit caused unilateral globe displacement in four patients, two of whom had a past history of orbital trauma. The onset of a painless vertical displacement of the globe ranged from 3 weeks to 4 years. Computed tomographic (CT) findings demonstrated a homogeneous, nonenhancing, subperiosteal mass in the superior orbit in three patients and the inferior orbit in one. At surgery, all patients had masses surrounded by a pseudocapsule without epithelial or endothelial lining. The history, age distribution, and CT findings help to differentiate this entity from other causes of unilateral exophthalmos.
mesh_terms: D000293:Adolescent; D000328:Adult; D002908:Chronic Disease; D003560:Cysts / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D006470:Hemorrhage / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D006801:Humans; D008297:Male; D009916:Orbital Diseases / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed