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Corleto’s health is fragile after several surgeries for a fibroma and other ailments.

About 14 percent of pediatric heart tumors are fibromas, according to Boston Children’s Hospital.

Michael, who then was diagnosed with a cardiac fibroma, was placed in a medically induced coma.

The Quality Deer Management Association notes that particularly dense fibromas can impact a deer’s eyesight, breathing, feeding or mobility, which can leave them more at risk for predators.

Oliver's condition - cardiac fibroma - causes his pulse to race dangerously fast.