"The Tumor" is a short story by John Grisham, telling about the focused ultrasound process through the case of a fictional character named Paul.

His brain develops a tumor, which causes gradual impaired function of his left side, and eventually a complete blackout.

Side effects of the cancer treatments prevent Paul from fully resuming his daily life, including his inability to go into work.

At this point, the narrative ends and Grisham acknowledges that eventually, the cancerous brain tumor will kill Paul.

Following this, Grisham explains the details of focused ultrasound therapy, including how it works, how far along the research and testing is for its application in various medical diagnoses, and what obstacles remain for its widespread adoption.

Ed Miller, M.D., of Johns Hopkins, stated "[Grisham] has pulled an exciting new medical technology out of the labs of academic research and onto the pages of an enlightening book.

Grisham published it anyway because of his belief that increased awareness could speed up research and approval of focused ultrasound, helping many patients.