<prompt> Retinoblastoma best evaluated by-UltrasonographyCT SCANCT SCAN MRIMRI  <response>: Retinoblastoma: To detect calcification in orbit: CT Scan To evaluate nerve invasion: MRIpreferred 2nd MC cancer in patient with retinoblastoma- osteosarcoma MC bone tumor that develops after radiotherapy to bones: osteosarcoma Trilateral retinoblastoma TRb: bilateral retinoblastoma Rb Pineal Gland tumor Quadrilateral retinoblastoma: Trilateral retinoblastoma supracellular mass INTRAORBITAL CALCIFICATION: RETINOBLASTOMA 