For me the definite things seen on my scans have been subsegmental bibasalar atelectasis, pleural effusion, and "possible" pericarditis. All of my symptoms started on Feb 23, 2019 after I had gotten really, really overexerted due to running. Since then I have actually felt like I'm in a perpetual state of getting overexerted--but all the discomfort I'm feeling is only on my right side. You know that feeling when you run and you can't get a full, deep, satisfying breath after? It is like something in your chest is just saying no I'm not going to let you take a deep breath. That's what every day has felt like along with chest pain. The doctors have called all of this pleurisy. I am researching diaphragm dysfunction along with pleural effusion. I think it's possible I may have had some sort of pleural effusion prior to running which caused the atelectasis. (Atelectasis is caused by pressure on the lungs.)