What clinical term describes the characteristic open spaces that appear in the lungs in cystic fibrosis?

Bronchiectasis refers to the irreversible dilation and damage of the bronchial tubes, which can occur as a consequence of chronic infections and inflammation in the lungs. In cystic fibrosis, the buildup of thick mucus leads to recurrent lung infections and inflammation, ultimately damaging the airway walls and causing them to become dilated. These dilated airways manifest as characteristic open spaces seen on imaging studies, which are indicative of bronchiectasis.

The other terms listed do not apply to the scenario in cystic fibrosis. Hypertrophy refers to an increase in the size of cells or tissues, often due to increased workload or hormonal stimulation, while atrophy denotes a decrease in cell size or number, which is not the case in cystic fibrosis-related lung pathology. Hyperplasia involves an increase in the number of cells in a tissue or organ, typically in response to stimuli, and does not characterize the structural changes seen in bronchiectasis.