I received the following report from a chest CT scan: There is evidence of a 3.2 cm x 1.6 cm x 2.5 cm irregular infiltration in the peripheral aspect of the superior segment of the left lower lobe. Air bronchograms are seen within this. This may represent a focal pulmonary infiltrate. Underlying mass lesion can not be ruled out. There is no demonstrated pleural abnormality.

What does this mean? The nurse said the my (primary care provider) PCP thinks it is fluid or an infection and not likely to be malignant. I am still worried. This seems very large and I don’t have symptoms of pneumonia. How concerned should I be that this is cancer? I am a 40 yo, female with no smoking history. This was initially found on a routine work x-ray. How should I proceed?