Re: A photo of a small roundworm found in the phlegm

Another type of mucus plug is called Atelectasis which is a complete or partial collapse of a lung or lobe of a lung that develops when the tiny air sacs (alveoli) within the lung become deflated. It's a breathing (respiratory) complication after surgery. Atelectasis is also a possible complication of other respiratory problems, including cystic fibrosis, inhaled foreign objects, lung tumors, fluid in the lung, respiratory weakness and chest injuries.

This does not sound like what was described. Tweet