I never expected to be diagnosed with breast cancer at age 24. So, when I found a mass in my left breast in the summer of 2017, I wasn’t really concerned. I assumed it was a fibroid, and waited until my annual check-up a few months later to ask my gynecologist about it.

She thought it was probably a fibroid, too, but she sent me to MD Anderson’s Undiagnosed Breast Clinic to be sure. There, I had a mammogram, followed by an ultrasound...