title: Frequency of molar pregnancies in health care centers of tehran, iran.
abstract: BACKGROUND
  Hydatidiform mole is an important obstetric problem which can result in harmful and serious outcomes. In this study, an attempt was made to determine the proportion of hydatidiform mole in prenatal clinics of Iran University of Medical Sciences (IUMS) to find the precise frequency of this disease.
  
  
  METHODS
  Between January 2012 and January 2013, all women who immediately after positive pregnancy test or after retarded menstruation came to prenatal clinics in health care centers of IUMS were included in the study. The women were followed until 8-10 weeks of pregnancy and at this time abdominal sonography was used for confirmation or exclusion of molar pregnancy.
  
  
  RESULTS
  In this descriptive study between January 2012 and January 2013, 8614 pregnant women with mentioned criteria were included and 61 cases of hydatidiform mole were diagnosed (0.7% or 7 per 1000 pregnancy). Ten cases (16.4%) were patients with partial moles. There was no significant difference in blood types in molar and non-molar pregnancies, but molar group differed significantly from non-molar group in terms of history of molar pregnancy, abortion, OCP use and ovulation induction.
  
  
  CONCLUSIONS
  Proportion of hydatidiform mole in this study was more than the reported European and American statistics.
authors.affiliation: Department of Radiology, Faculty of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran.
authors.forename: Alireza
authors.initials: A
authors.lastname: Almasi
authors.affiliation: Minimally Invasive Surgery Research center, Iran University of Medical Sciences, Tehran, Iran ; Department of Obstetrics and Gynecology, Rasoul-e-Akram Hospital, Iran University of Medical Sciences (IUMS), Tehran, Iran.
authors.forename: Fariba
authors.initials: F
authors.lastname: Almassinokiani
authors.affiliation: Tehran University of Medical Sciences (TUMS), Tehran, Iran.
authors.forename: Peyman
authors.initials: P
authors.lastname: Akbari
keywords: Gestational trophoblastic disease; Hydatidiform mole; Proportion