Table 3. .
Variations of descriptors for the posterior nipple line as applied to the craniocaudal view
| Source | Descriptor of the posterior nipple line for the CC | 
| Bassett et al, 199336 p. 803–804 | Directly posteriorly from nipple to pectoral muscle or edge of film, whichever comes first | 
| Eklund et al, 199464 p. 30063 | Nipple-skin to back of image (regardless of pectoral muscle inclusion) | 
| American College of Radiology, 201759 | Nipple to posterior edge of the image | 
| BreastScreen Australia, 201517 p. 180 | Nipple to pectoral muscle | 
CC, craniocaudal.