"This can be very frustrating for patients. Sometimes we can only detect abnormalities by doing a lung function test," says Dr. "Shortness of breath from Long COVID is very subtle on the CT scan, and sometimes abnormalities are not seen at all. However, some Long COVID patients have clear symptoms, like shortness of breath, yet their scans appear normal. One of the potential consequences of long COVID is post-COVID fibrosis which can be seen on lung imaging by CT scan. Long COVID-19 (also called post-COVID) is defined as new or current symptoms that persist 30 days after initial COVID-19 infection. If an ongoing issue is the cause, like smoking, the scarring gets progressively worse over time. If fibrosis is due to COVID-19, the scarring may be persist from a long time and then slowly resolve. Over time, due to combination of genetic and environmental factors like pollution or cigarette smoke.
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