title: Midline upper lip sinus: a case report and review of literature.
abstract: OBJECTIVE
  A multitude of developmental anomalies has been reported in the head and neck, especially on the face; however, cases of upper lip sinuses and fistulas have hardly been reported.
  
  
  METHODS
  A 10-year-old girl presented with a recurrently discharging upper lip sinus. After adequate presurgical workup, excision of the lesion resulted in a clinical cure.
  
  
  RESULTS
  Literature review suggests a number of theories for the origin of the upper lip sinus; however, none have proven to be conclusive.
  
  
  CONCLUSIONS
  Upper lip sinus formations are rare developmental events, and the pathogenesis of these lesions still needs further evaluation.
authors.affiliation: Department of ENT and Head & Neck Surgery, Mahatma Gandhi Medical College & Research Institute, Pillaiyarkuppam, Pondicherry, 607402, India, saty.bakshi@gmail.com.
authors.forename: Satvinder Singh
authors.initials: SS
authors.lastname: Bakshi
authors.forename: M
authors.initials: M
authors.lastname: Kiruba Shankar
authors.forename: S
authors.initials: S
authors.lastname: Gopalakrishnan
mesh_terms: D006801:Humans; D011329:Prisoners / Q000523:psychology*