Yes it has happened. And the brain’s plasticity is marvelous and shifted to take over functions that the missing part would have done. Chemo brain, stroke, phantom limbs - understanding neuroplasticity has led to many interventions to support change in the brain to allow for recapturing abilities lost. Huge in the life of the impacted person.
The brain that changes itself...watch the film (link in the brain photo) to see why we use the interventions we do in our Tame Your Tiger Brain Training