Michael Strahan reveals daughter Isabella has a brain tumor

Michael Strahan's teenage daughter has been diagnosed with a brain tumor.

Isabella Strahan is just 19-years-old and received the devastating diagnosis in October of last year.

The Good Morning America star's daughter has medulloblastoma, a malignant tumour of the central nervous system, most commonly found in the cerebellum in children.

Initially Isabella thought she was suffering with vertigo, but her symptoms grew worse, sparking her concerned family to urge her to seek medical attention.

"That was when we decided, 'You need to really go get a thorough checkup'," Strahan recalled to his GMA co-star, Robin Roberts.

"And thank goodness for the doctor. I feel like this doctor saved her life because she was thorough enough to say, 'Let's do the full checkup'."

Isabella went on to have an electrocardiogram and an MRI scan which found that the 19-year-old had a fast-growing tumor larger than a golf ball in the back of her brain.

GMA

Medulloblastoma is said to account for 20 percent of all childhood brain tumors, but it's 'rare' for someone of Isabella's age, according to the former professional football player.

On her 19th birthday, Isabella underwent emergency surgery at Cedars-Sinai to remove the mass.

Following the surgery, Isabella had a month of rehabilitation and several rounds of radiation treatment - which she's just finished.

"I got to ring the bell yesterday," she told Roberts. "It was great. It was very exciting because it's been a long 30 sessions, six weeks."

While Isabella's treatment left her feeling fatigue, some nausea and dizziness, she said she's 'feeling good'.

The teenager is set to begin chemotherapy next month. She'll have to travel to Duke Children's Hospital & Health Center in Durham, North Carolina, for her treatment.

GMA

While she's kept her health battle private up until now, Isabella is going to partner up with the hospital and document her chemotherapy journey for a YouTube series.

"I hope to just kind of be a voice, and be [someone] who people, maybe [those who] are going through chemotherapy or radiation can look at," she said of her decision to film her treatment.

Once her treatment finishes, Isabella hopes to return to California to resume her college studies at the University of Southern California.

Isabella said: "I'm looking forward to getting back to college and moving back to California and just starting my school experience over.

"Not over, but just restarting, being back into a routine and something that's enjoyable."