x ray showed marks or streaks on my 10 yr old sons lungs

my son received an injury in football and i took him to er just to have him checked. they did a chest x-ray and the dr. said there are streaks or some markings on his lungs and said to have it checked again in a month. she asked if he had had pnemonia (pneumonia) or been sick which he hasnt. should i be worried and what could these marks on his lungs be?

[Dr Santos]

Hi,
How is your son? Are there other symptoms present? Some markings or lesions in the lungs may be incidental findings and repeat chest x-rays are often necessary to determine if these are significant or if there are changes or not. These could be scars from previous infections such as pneumonia which was already asked or from primary complex. Take care and do keep us posted with the repeat xray. Warm regards.