The Houstonian Hotel, 111 Post Oak Lane. The CERN Foundation released more than 700 butterflies this afternoon to commemorate the 3rd Annual National Ependymoma Awareness Day. Ependymoma is a rare form of brain cancer that can be very difficult to treat.br/They released Monarch Butterflies, Painted Ladies, Great South Whites, Buckeyes, Zebra Longwings and Julia Longwings.br/ID: six-year-old Kyla Odom is delighted playing with Monarch Butterflies.br/4/10/14 (Craig H. Hartley/For the Chronicle)