Medial or lateral mammographic lesions: down and out is down and out ... sometimes.
When there is doubt whether a mammographic lesion is medial or lateral to the nipple, the "down and out" rule is commonly employed. This states that a density moves inferiorly (down) on the mediolateral compared with the mediolateral oblique view if it is lateral (out) to the nipple. The author found areas in each breast, however, where the down and out rule does not apply.
Department of Diagnostic Radiology, Mayo Clinic and Foundation, Rochester, MN 55905, USA.
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Rose
D001943:Breast Neoplasms / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008327:Mammography / Q000379:methods* / Q000706:statistics & numerical data; D009558:Nipples