Disk or platelike atelectasis is collapsed areas of the lung that have a linear or horizontal appearance. They look like a CD, viewed from the side. They occur with a blood clot or clots to the lung, but more often they occur without any significant lung disease.
You should discuss this with your doctor. You should have another X-ray in a month and, if these findings persist, it may be necessary to do further testing, such as a CT scan or a Lung Scan.