Is hyperaerated lungs treatable?

Kind of...: "hyperaeration" or "hyperinflation" is sometimes used to describe the chest xrays of patients with obstuctive lung disease like COPD or severe asthma. The "hyperaeration" itself isn't treated, but the underlying condition that causes it usually can be depending on what disease it is. Generally, this is copd, the symptoms of which are treatable with a variety of inhaled and even oral medications.

Yes: If there is diagnosis of emphysema. And it is bullous disease. There are variety of ways to treat it.

Not reversible: If the cause is known such as cops/emphysema it is treatable. There are people whose lung simply look hyperaerated but no disease, no treatment necessary. In asthma exacerbation, air trapping can occur and cause hyperaerated looking lung and if treated the cxr reverses. Hyperaeration by the way is a diagnosis made on imagings.