'GMA' Host Michael Strahan's Daughter Reveals Brain Tumor Diagnosis

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Michael Strahan came on his own show to share that his daughter was recently diagnosed with a rare brain cancer ... and it explains why he'd taken off so much time from his TV jobs back in the fall.

The 'GMA' host sat for a segment on the ABC program Thursday opposite his coworker Robin Roberts -- where he and his 19-year-old, Isabella, revealed she's been receiving treatment lately for a malignant tumor doctors found in her brain in October.

ABC

The cancer is known as medulloblastoma, and in the package they aired ... Roberts goes into detail about the size of the tumor that was discovered by doctors -- noting it was about as big as a golf ball and lodged toward the base of her skull.

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Once they discovered the tumor, Isabella underwent emergency surgery at Cedars-Sinai in L.A. ... which is where Michael's daughter was attending college at USC.

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