Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Retinoblastoma ?
    ### Response:
    The following tests and procedures may be used:         -   Physical exam and history : An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patients health habits and past illnesses and treatments will also be taken.
    