What Do Smooth Hemidiaphragms, Intact Costophrenic Sulci, And Unremarkable Osseous And Soft Tissues In An X-ray Mean?

what does it mean when the chest x-ray result shows that the lungs are clear. trachea is in the midline . the heart is not enlarged. the hemidiaphragms are smooth. the costophrenic sulci is intact. rest of the visualized osseous and soft tissues are unremarkable