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

Introduction 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 CQUniversity 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 Tabar 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