title: Bilateral congenital choanal atresia and osteoma of ethmoid sinus with supernumerary nostril: a case report and review of the literature.
abstract: BACKGROUND
  Congenital choanal atresia is a relatively rare deformity, especially bilateral congenital choanal atresia. We report a case of bilateral congenital choanal atresia in a 22-year-old Chinese man, who was also diagnosed with congenital right accessory nasal deformity, osteoma of his left ethmoid sinus and congenital keratoleukoma of his right eye.
  
  
  METHODS
  A 22-year-old Chinese man presented with mouth breathing, sleep snoring and difficult feeding after birth, with no olfactory sensation. Three-dimensional computed tomography revealed bilateral choanal atresia and a high density bony shadow in his left ethmoid sinus that extended to his left frontal sinus.
  
  
  CONCLUSIONS
  Choanal atresia is often accompanied by other congenital abnormalities. To the best of our knowledge, this is the first report of choanal atresia accompanied by congenital accessory nasal deformity and congenital keratoleukoma.
authors.affiliation: Department of Otolaryngology, Qilu Hospital, Shandong University, Ji'nan 250012, China. zhangleicome@126.com.
authors.forename: Xue-Zhong
authors.initials: XZ
authors.lastname: Li
authors.forename: Xiao-Lan
authors.initials: XL
authors.lastname: Cai
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Xue-Feng
authors.initials: XF
authors.lastname: Han
authors.forename: Xiao
authors.initials: X
authors.lastname: Wei