title: Orbito-nasal cyst in a young European short-haired cat.
abstract: OBJECTIVE
  To describe a case of an orbito-nasal cyst in a cat.
  
  
  METHODS
  An 18-month-old male European short-haired cat was presented to the Ophthalmology service of the Vetsuisse Faculty, University of Zurich for a subcutaneous swelling in the medial canthal region of the right eye (OD). Ophthalmologic, ultrasound and CT examinations, and fine needle aspiration were performed. After lesion excision, the removed tissue was submitted for histopathology. CT examination was repeated 5 months after removal of the cyst.
  
  
  RESULTS
  Ophthalmologic examination revealed a large fluctuant swelling inferonasal to OD. Despite patent lacrimal puncta, only the first few mm of the lacrimal canaliculi could be cannulated. A normal globe with moderate enophthalmos was present. Ultrasound examination showed a well-defined lobulated cyst-like structure in the right orbit, inferonasal and anterior to the eye. CT examination revealed extension of this lesion through the medial orbital wall into the right nasal cavity. Fine needle aspiration confirmed the cystic nature of the lesion. An orbito-nasal cyst was diagnosed. The orbital part of the cyst was dissected from the surrounding tissue and excised from the periosteum in the medial orbital wall defect. Part of the maxillary bone was removed to allow removal of the cyst from the nasal cavity. Histologically, the cyst wall consisted of a single to multilayered, mostly cuboidal epithelium and surrounding connective tissue. Follow-up revealed a good functional result and no recurrence 7 months after cyst removal.
  
  
  CONCLUSIONS
  Similar orbito-nasal cystic structures were reported in dogs but not in cats.
authors.affiliation: Equine Department, Section of Ophthalmology, Vetsuisse Faculty, University of Zurich, CH-8057 Zurich, Switzerland. zemljita@yahoo.com
authors.forename: Tadej
authors.initials: T
authors.lastname: Zemljič
authors.forename: Franziska L
authors.initials: FL
authors.lastname: Matheis
authors.forename: Claudio
authors.initials: C
authors.lastname: Venzin
authors.forename: Mariano
authors.initials: M
authors.lastname: Makara
authors.forename: Paula
authors.initials: P
authors.lastname: Grest
authors.forename: Bernhard M
authors.initials: BM
authors.lastname: Spiess
authors.forename: Simon A
authors.initials: SA
authors.lastname: Pot
mesh_terms: D000818:Animals; D002371:Cat Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D002415:Cats; D003560:Cysts / Q000175:diagnosis / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D008297:Male; D009668:Nose Diseases / Q000175:diagnosis / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D009916:Orbital Diseases / Q000175:diagnosis / Q000473:pathology / Q000601:surgery / Q000662:veterinary*