Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . As previously mentioned , there is a small nodular opacity in the left lower lung , which could represent a calcified granuloma or possibly a bony abnormality in the chest wall . Given the stable appearance since a remote chest radiograph dated ___ , a benign etiology is favored . Otherwise , the lungs are clear without worrisome consolidation , effusion , pneumothorax . Heart size is within normal limits . Degenerative changes in the spine noted .
    OUTPUT:
    
No acute findings in the chest . Nodularity in the left mid to lower lung is stable from multiple prior exams and is likely benign . Otherwise unremarkable exam .