True about retinoblastoma are all Except
It is the most common intraocular tumour of childhood occurring 1 in 20,000 live bihs.Age: though congenital, it is not recognized at bih, 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.