###Human: What does streakiness in X-ray of lower lung indicate? ###Assistant: Hello. Does not look worrisome (attachment removed to protect patient identity). Small streaks or fibrosis is usually due to old infection or collapses etc., The usual cause for such fibrosis is typically an infection and commonly found at such age groups. The probability of IPF (idiopathic pulmonary fibrosis) is extremely low as the fibrosis is not diffuse or bilateral, no symptoms and spirometry are normal. So, I think it is not worrisome at present and should follow up as advised to be sure. Should consult your doctor earlier if developed any symptoms. Majority of the scar is non-progressive and extremely common to find such scars on routine X-ray and the majority are benign. I hope this helps you and get back if you have any doubts.