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The objective of the study was to document the distribution of mammographic parenchymal patterns ( MPP ) of Indigenous Australian women attending BreastScreen New South Wales ( NSW ) North Coast, to profile breast cancer risk as it relates to breast density and to explore the correlation between  MPP , breast size as described by the posterior nipple line ( PNL ) and age.    Methods  Ethics was granted from  CQU niversity Human Research Ethics Committee,  NSW  Population Health Services Research Ethics Committee and the Aboriginal Health and Medical Research Council Ethics Committee. A quantitative retrospective analysis reviewed 502 screening mammograms against the Tabár I–V  MPP  classification system. The  PNL  was measured in millimetres (mm) and the age of the patient documented.    Results  A statistically significant variation in the distribution of  MPP  ( P  < 0.0001) was demonstrated, with patterns of I (23.9%), II (45.6%), III (10.4%), IV (15.9%) and V (4.2%). Statistically significant differences were noted in the age of subjects between patterns ( P  = 0.0002). Patterns I and V demonstrated statistically significant lower ages than II, III and IV (all  P  < 0.05). Pattern V demonstrated a statistically significant lower age than pattern I ( P  = 0.0393). Pattern V demonstrated a statistically significant lower  PNL  value than all other patterns (all  P  < 0.001/ P  < 0.0002); pattern II was statistically significantly higher in  PNL  value than all other patterns ( P  < 0.002/ P  < 0.001). No significant relationship was noted between  PNL  and age.    Conclusion  The study demonstrated that no identifiable or unique distribution of  MPP  was noted in this snapshot of Indigenous women. A larger study of Indigenous Australian women is required for validation.

Mammographic parenchymal patterns and breast cancer risk in N ew S outh W ales N orth C oast A boriginal and T orres S trait I slander women