Which of the following is not of prognostic significance to choroidal melanoma ?
Presence of retinal detachment
Size of the tumour
Cytology of the tumor cells
Presence of extraocular extension
Prognosis of choroidal melanoma depends upon :-

Cell type
Size of tumor
Location of tumor
Evidence of invasion (extrascleral or vortex vein)
Age of the patient
Cytology
Chromosomal abnormalities.