Today a young girl with a lot of fun stuff to get done instead has an appoint­ment at Dana-Farber ­Children’s Hospital Cancer Center, where specialists plan to make a picture of her brain.

At age 5, Caroline Cronk, best known as Calle, is no fan of medical procedures, needles, and forced stillness. She prefers a good princess dress, a microphone, and a dance floor. It would not be her choice, if she had one, to close her eyes and let adults construct images of what lies ­inside her head.