Posterior nipple line

The posterior nipple line (PNL) refers to a line drawn posteriorly and perpendicularly from the nipple towards the pectoral muscle (or the posterior image edge in CC) on the mammograms. In an adequately positioned 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
Synonyms or Alternate Spellings:
  • Posterior nipple line (PNL)
  • PNL

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