title: Assessment of the lacrimal recess of the maxillary sinus on computed tomography scans.
abstract: OBJECTIVE
  To assess the frequency of the lacrimal recess in the maxillary sinus (MS) in computed tomography (CT) of the paranasal sinuses.
  
  
  METHODS
  CT of the paranasal sinuses (CT PNS) done in a total of 78 patients. According to the discoveries, the MS were classified in two types: anterior or lateral.
  
  
  RESULTS
  41 CT PNS of 41 patients of a total of 78 patients preselected were excluded. 37 CT of the paranasal sinuses from 37 patients, in a total of 68 maxillary sinuses were studied. In the 33 right maxillary sinuses, 10 lacrimal recesses were found, 9 from male patients. Eleven left maxillary sinuses with lacrimal recess were found from a total of 35 left maxillary sinuses.
  
  
  CONCLUSIONS
  From the analysis of 68 MS, a frequency of 30.9% of lacrimal recesses in the maxillary sinuses in CT was observed.
authors: Discipline of Otorhinolaryngology, School of Medical Sciences - Unicamp - Campinas - São Paulo - Brazil.
authors: Paulo de Lima
authors: Pde L
authors: Navarro
authors: Almiro José
authors: AJ
authors: Machado
authors: Agrício Nubiato
authors: AN
authors: Crespo
mesh_terms: D005260:Female; D006801:Humans; D007765:Lacrimal Apparatus / Q000000981:diagnostic imaging*; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging*; D008875:Middle Aged; D056888:Patient Positioning / Q000379:methods*; D011856:Radiographic Image Enhancement / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*