title: Canalicular Cyst.
abstract: OBJECTIVE
  To report a new entity discovered in the lacrimal drainage system, a congenital canalicular cyst (as opposed to a diverticulum or canaliculops).
  
  
  METHODS
  Clinical, radiographic, histopathologic and immunohistochemical findings were reviewed.
  
  
  RESULTS
  A 49-year-old man developed a left upper eyelid cyst seen by CT scanning to be attached to a small boney spicule. No connection to the lacrimal sac or canaliculus was discovered during surgical excision. Histopathologically, the cyst was lined mostly by canalicular epithelium, expressing a cytokeratin profile similar to that of a normal canaliculus and canaliculops.
  
  
  CONCLUSIONS
  This case increases ophthalmologists' appreciation of the range of conditions that can affect the lacrimal drainage and canalicular system. The treatment for a diverticulum is marsupialization, whereas that for a canalicular cyst is complete excision.
authors.affiliation: Department of Ophthalmology, Harvard Medical School, Boston, Mass., USA; David G. Cogan Laboratory of Ophthalmic Pathology, Boston, Mass., USA.
authors.forename: Frederick A
authors.initials: FA
authors.lastname: Jakobiec
authors.affiliation: Department of Ophthalmology, Harvard Medical School, Boston, Mass., USA; David G. Cogan Laboratory of Ophthalmic Pathology, Boston, Mass., USA.
authors.forename: Anna M
authors.initials: AM
authors.lastname: Stagner
authors.affiliation: Department of Ophthalmology, Harvard Medical School, Boston, Mass., USA; Ophthalmic Plastic Surgery, Massachusetts Eye and Ear Infirmary, Boston, Mass., USA.
authors.forename: Michael K
authors.initials: MK
authors.lastname: Yoon
keywords: Canalicular cyst; Canaliculocele; Dacryops; Diverticulum; Eyelid