Imagine a world free of breast cancer... you can help! Breast cancer is the most commonly diagnosed cancer in women and mammograms are the best way to find breast cancer in its earliest, most treatable form. Early detection can save lives. Mammography Vans will provide free on-site screenings at Walmart locations in Missouri and Illinois between August through October 2015. Each event offers pre-scheduled and walk-up appointments. To schedule your appointment or for details on dates and times, click here.