title: Epithelial cyst of the superior oblique muscle trochlea.
abstract: Most of the congenital orbital cysts are choristomas such as dermoid or epidermoid and only in a few cases they are epithelial. Clinically, they manifest as cystic movable formations mostly localized in the upper temporal quadrant of the orbit. We describe here the case of a 49-year-old man with an orbital cyst localized in the upper-nasal quadrant of the orbit and which was showing signs of a gradual enlargement and progression over the past weeks. Computed tomography revealed a cyst of 1.9 × 1.6 cm in size and located within the trochlea of the upper oblique muscle. The cyst was completely extirpated after orbitotomy performed by superciliary approach. Histopathology revealed a cyst with nonkeratinized cuboidal epithelium. Postoperative course was uneventful, without inflammation signs, and after 5 weeks excellent functional and aesthetic effects were achieved with no iatrogenic alteration of the ocular motility.
authors.affiliation: Department of Neurosurgery, Policlinico "Santa Maria alle Scotte" , Siena , Italy .
authors.forename: Simone
authors.initials: S
authors.lastname: Ulivieri
authors.forename: Paolo
authors.initials: P
authors.lastname: Galluzzi
authors.forename: Antonio
authors.initials: A
authors.lastname: Giorgio
authors.forename: Roberto
authors.initials: R
authors.lastname: Lio
authors.forename: Damiana
authors.initials: D
authors.lastname: Tacchini
authors.forename: Mario
authors.initials: M
authors.lastname: Fruschelli
mesh_terms: D003884:Dermoid Cyst / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D019042:Muscle Neoplasms / Q000473:pathology* / Q000601:surgery; D009801:Oculomotor Muscles / Q000473:pathology*; D009915:Orbit / Q000473:pathology
keywords: Epithelial cyst; orbital mass; superior oblique muscle