title: Three-dimensional images contribute to the diagnosis  of mucous retention cyst in maxillary sinus.
abstract: OBJECTIVE
  To evaluate the detection of mucous retention cyst of maxillary sinus (MRCMS) using panoramic radiography and cone beam computed tomography (CBCT).
  
  
  METHODS
  A digital database with 6,000 panoramic radiographs was reviewed for MRCMS. Suggestive images of MRCMS were detected on 185 radiographs, and patients were located and invited to return for follow-up. Thirty patients returned, and control panoramic radiographs were obtained 6 to 46 months after the initial radiograph. When MRCMS was found on control radiographs, CBCT scans were obtained. Cysts were measured and compared on radiographs and scans. The Wilcoxon, Spearman and Kolmorogov-Smirnov tests were used for statistical analysis. The level of significance was set at 5%.
  
  
  RESULTS
  There were statistically significant differences between the two methods (p<0.05): 23 MRCMS detected on panoramic radiographs were confirmed by CBCT, but 5 MRCMS detected on CBCT images had not been identified by panoramic radiography. Eight MRCMS detected on control radiographs were not confirmed by CBCT. MRCMS size differences from initial to control panoramic radiographs and CBCT scans were not statistically significant (p= 0.617 and p= 0.626). The correlation between time and MRCMS size differences was not significant (r = -0.16, p = 0.381).
  
  
  CONCLUSIONS
  CBCT scanning detect MRCMS more accurately than panoramic radiography.
authors.affiliation: Brazilian Dentistry Association, Brasília, Brazil.
authors.forename: Cleomar
authors.initials: C
authors.lastname: Donizeth-Rodrigues
authors.forename: Márcia
authors.initials: M
authors.lastname: Fonseca-Da Silveira
authors.forename: Ana-Helena
authors.initials: AH
authors.lastname: Gonçalves-De Alencar
authors.forename: Maria-Alves
authors.initials: MA
authors.lastname: Garcia-Santos-Silva
authors.forename: Elismauro
authors.initials: E
authors.lastname: Francisco-De-Mendonça
authors.forename: Carlos
authors.initials: C
authors.lastname: Estrela
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D054893:Cone-Beam Computed Tomography; D003560:Cysts / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging*; D008875:Middle Aged; D010254:Paranasal Sinus Diseases; D011862:Radiography, Panoramic; D055815:Young Adult