title: Intracranial arachnoid cyst; an unusual cause of epiphora.
abstract: OBJECTIVE
  To describe a case of unilateral intracranial arachnoid cyst in association with enophthalmos and epiphora on the same side.
  
  
  METHODS
  Case report.
  
  
  RESULTS
  A young man with symptoms of unilateral epiphora is described. He had a large intracranial arachnoid cyst with an unusually large orbit leading to enophthalmos and symptomatic epiphora on that side. Radiological features of the orbit and associated pneumosinus dilatants are described. We also offer hypotheses to describe the paradoxical occurrence of an expanding intracranial mass and inward growth of the orbit and paranasal sinuses.
  
  
  CONCLUSIONS
  A new cause for enophthalmos is described.
authors.affiliation: Department of Ophthalmology, Countess of Chester Hospital NHS Foundation Trust, Chester, United Kingdom.
authors.forename: Kimia
authors.initials: K
authors.lastname: Ziahosseini
authors.forename: Islah
authors.initials: I
authors.lastname: Din
authors.forename: Jonathan
authors.initials: J
authors.lastname: Bhargava
mesh_terms: D000293:Adolescent; D016080:Arachnoid Cysts / Q000150:complications* / Q000175:diagnosis* / Q000601:surgery*; D003937:Diagnosis, Differential; D015841:Enophthalmos / Q000209:etiology* / Q000601:surgery*; D006801:Humans; D007766:Lacrimal Apparatus Diseases / Q000209:etiology* / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D020273:Orbital Implants; D014057:Tomography, X-Ray Computed