My friend described the condition as a ‘permanent’ mucus sac in her lung....long Covid-19 side effect.
From the NIH site:
Bronchiectasis is a condition that occurs when the tubes that carry air in and out of your lungs get damaged, causing them to widen and become loose and scarred. These tubes are called airways.
Although the cause of bronchiectasis is unknown, bronchiectasis usually results from an infection or other condition that injures the walls of your airways or keeps the airways from clearing the mucus they make.....