Posterior nipple line

The posterior nipple line (PNL) refers to a line drawn posteriorly and perpendicularly from the nipple towards the pectoral muscle on the mammogram. In an adequately exposed breast, the measurement difference of this line between a CC view and MLO view should be ideally within 1 cm. It is the first key to triangulate mammographic lesions.

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Article information

rID: 15044
System: Breast
Tags: stub, cases
Synonyms or Alternate Spellings:
  • Posterior nipple line (PNL)
  • PNL

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