Nipple shadows in chest xray characteristically have a sharp
Medial margin
Lateral margin
Superior margin
Inferior margin
Miller et al proposed that solitary pulmonary nodules that reach some or all of the following criteria can be considered nipple shadows :Bilateral and symmetric"fuzzy" margins or radiolucent "halo"Sharp lateral border and poorly defined medial border (may be present only on pa projections 3)Nodules are in a characteristic position:Male: between fifth and sixth rib anteriorlyFemale: at the inferior aspect of the breast shadowWere not present on a very recent filmProminent nipples may be visible on a lateral projectionHowever, if there is doubt repeat chest x-ray with nipple markers should be performed.(Ref: Miller WT, Aronchick JM, Epstein DM et-al. The troublesome nipple shadow. AJR Am J Roentgenol. 1985;145 (3): 521-3.)
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