title: [Functioning ovarian cysts in patients with and without tubal sterilization].
abstract: OBJECTIVE
  To determine by ultrasound, the frequency of function ovary cysts (FOC) in patients with surgical sterilization by bilateral tubal obstruction (BTO) compare to a similar group without previous surgery.
  
  
  METHODS
  Between August '96 and September 97, 290 patients were divided in 2 groups of 145 each. The first group were patients with BTO and the second, without. Each group was divided in 8 equal subgroups.
  
  
  RESULTS
  In the patients with FOC, 35 cases (24.1%) had BTO compared to 18 (12.4%) from the group without the previous surgery. In both groups a parallel increase was detected between the 36-45 years there aren't variation in the FOE curves relates to the ratio.
  
  
  CONCLUSIONS
  The presence of FOB is significantly greater in patients with BTO than in those without this antecedent. The age factor influence by itself in a uniform way, in both groups and its assume to alterations due function declination. The ratio seem to have influence in the apparition of FOC.
authors.affiliation: Departamento Radiodiagnóstico, Hospital General de Zona 6, Instituto Mexicano del Seguro Social.
authors.forename: F
authors.initials: F
authors.lastname: de Alba Quintanilla
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008875:Middle Aged; D010048:Ovarian Cysts / Q000000981:diagnostic imaging* / Q000453:epidemiology; D012189:Retrospective Studies; D013246:Sterilization, Tubal; D014463:Ultrasonography