title: Mucosal cyst of lacrimal gland fossa simulating lacrimal gland neoplasm.
abstract: A 28-year-old man presented with an orbital tumour that was localized by computérized tomography to the fossa of the right lacrimal gland. A benign mixed tumour of the lacrimal gland was the clinical diagnosis, but lateral orbitotomy revealed a subperiosteal cystic mass in the lacrimal gland fossa that extended superiorly and medially into the frontal sinus. Light microscopic examination showed a cyst lined by nonkeratinized stratified squamous epithelium with occasional goblet cells; blood products were present in the lumen, and a chronic inflammatory cell infiltrate was noted in the subepithelial tissue. The possible origins of this mucosal tissue are discussed.
mesh_terms: D000328:Adult; D003560:Cysts / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D006801:Humans; D007765:Lacrimal Apparatus / Q000601:surgery; D007766:Lacrimal Apparatus Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D009369:Neoplasms / Q000175:diagnosis*; D009915:Orbit / Q000601:surgery; D014057:Tomography, X-Ray Computed