Hi doctors, can you tell me what is residual ards(acute respritory distress syndrome)?

Misnomer: ARDS is diffuse inflammation in the lungs of any cause. Cxr will show the increase in interstitial markings as the intertitium becomes thicker from the inflammation. As it improves, there is improvement of such findings. Later, the inflammation can cause some pulmonary fibrosis and persistent increase in interstitial markings by xr. That is most likely what someone is calling residual ards.