Hi, im 34 years old male. recently in my plain x-ray pa view of the chest revealed: left lower zonal small fibrotic strand seen. can you pls exp?

Common: Probably the residual of some type of old lower respiratory infections. Talk to your doctor. Probably a reasonable thing to do is recheck and x-ray in 6 months.

Explanation : For professional answer we need to know your clinical symptoms and medical history about your previous lung condition. It may be just old scar from previous disease: pneumonia, atelectasis, tuberculosis , or surgery, trauma and so on.