Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A nodule projecting over the left ninth posterior rib measures 1 cm . There is no focal consolidation , pulmonary edema , pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal .
    OUTPUT:
    
1 cm nodule projecting over the left ninth posterior rib may represent a nipple shadow , however , an underlying nodule can not be excluded . Shallow oblique radiographs with nipple markers are recommended .