well, nice to see a lot of comments on this topic, let me tell you something,There can be artifacts in the xray(rare and unlikely with the kind of machines they have now)There could be also other pathologies related to the lungs like pneumonia, TB, or any other pathology. If its a Tb then they would also do a Sputum test along with blood test. In some cases, they would prescribe antibiotics and recall again after 2 to 3 weeks for a repeat chest Xray. So dont come to any conclussions unless they come to a diagnosis.