title: Lesions Simulating Retinoblastoma at a Tertiary Care Center.
abstract: OBJECTIVE
  To determine the types and frequency of ocular conditions simulating retinoblastoma (pseudo-retinoblastoma) at Farabi Eye Hospital, Tehran, Iran.
  
  
  METHODS
  We reviewed data of patients who were referred with a diagnosis of retinoblastoma to Farabi Eye Hospital oncology clinic, from January 2009 to July 2013. Examination under general anesthesia was performed for all patients. Other investigations, such as ultrasonography, were performed as required.
  
  
  RESULTS
  Of a total of 331 patients (aged 1-60 months), 138 (42%) were found to be suffering from a benign disorder. Among these pseudo-retinoblastoma cases, Coats' disease was the most prevalent codition (n = 36, 26%); persistent hyperplastic primary vitreous (PHPV) and familial exudative vitreo-retinopathy (FEVR) were the next two common pseudo-retinoblastoma cases in our series.
  
  
  CONCLUSIONS
  The rate of misdiagnosis upon referral to our center was close to 40%. The most common pseudo-retinoblastomas entities include Coats' disease, PHPV and FEVR. An accurate diagnosis is essential for management of pseudo-retinoblastoma cases.
authors.affiliation: Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Fariba
authors.initials: F
authors.lastname: Ghassemi
authors.affiliation: Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Bazvand
authors.affiliation: Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Makateb
keywords: Coats’ Disease; Pseudo-retinoblastoma; Retinoblastoma