Atypical Teratoid/Rhabdoid Tumor (AT/RT) is a rare and fast-growing tumor that typically originates in the brain and spinal cord. These tumors most often occur in the part of the brain called the cerebellum, which controls movement and balance, or in the brain stem, which controls vital functions like breathing and heart rate. AT/RT mainly occurs in children under the age of three, but it can occur in older children and very rarely in adults. AT/RT is found in fewer than 3% of children with...