title: A patient presenting with concha bullosa in another concha bullosa: a case report.
abstract: BACKGROUND
  Anatomic variations of the paranasal sinuses are very common. The paranasal sinus anatomy should be carefully examined prior to performing endoscopic sinus surgery in terms of both existent pathologies and anatomic variations. The anatomy of the paranasal sinuses and its variations have gained importance, along with advances in coronal paranasal sinus computed tomography and extensive use of endoscopic sinus surgery.
  
  
  METHODS
  A 53-year-old Caucasian woman was admitted to our clinic with complaints of nasal breathing difficulties and headache persisting for a long time. Another concha bullosa was detected in the middle concha bullosa on preoperative paranasal computed tomography examination. It is known that the paranasal sinuses have a number of anatomical variations.
  
  
  CONCLUSIONS
  Herein we report a rare case, along with a review of the literature, to emphasize that a concha bullosa inside another concha bullosa should not be ignored.
authors.affiliation: Department of Otolaryngology and Neck and Head Surgery, The Ministry of Health Izmir Tepecik Training and Research Hospital, 35170, Izmir, Turkey. aytekinyaz@hotmail.com.
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Cukurova
authors.forename: Aytekin
authors.initials: A
authors.lastname: Yaz
authors.forename: Murat
authors.initials: M
authors.lastname: Gumussoy
authors.forename: Orhan G
authors.initials: OG
authors.lastname: Yigitbasi
authors.forename: Yucel
authors.initials: Y
authors.lastname: Karaman