True about retinoblastoma are all except :
Retinoblastoma
Incidence:  It is the most common intraocular tumor of childhood occurring 1 in 20,000 live births.
Age : though congenital, it is not recognized at birth, and is usually seen between 1 and 2 years of age.
Sex : There is no sex predisposition.
Race : it is rarer in Negroes than whites.
Bilaterality : In 25-30% cases, there is bilateral involvement, although one eye is affected more extensively and earlier than the other.
AD
Most common intraocular tumor of childhood
Females are more affected than males
Bilateral involvement not rare