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Factors associated with mammographic pattern.

J S Grove, M J Goodman, F I Gilbert

    The British Journal of Radiology
    |January 1, 1985
    PubMed
    Summary
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    Breast density patterns change with childbirth. Each pregnancy reduces the likelihood of dense P2 patterns, increasing P1 and N1 patterns. Low body weight is linked to specific mammographic patterns.

    Area of Science:

    • Radiology
    • Mammography
    • Breast Imaging

    Background:

    • Wolfe's criteria are widely used for mammographic parenchymal pattern classification.
    • Understanding factors influencing breast density is crucial for accurate mammogram interpretation and breast cancer risk assessment.

    Purpose of the Study:

    • To investigate the association between parity, body weight, age, menopause, and ethnic group with mammographic parenchymal patterns (Wolfe's criteria).

    Main Methods:

    • Retrospective analysis of mammograms from 202 women without a history of breast cancer.
    • Classification of mammographic patterns using Wolfe's criteria (P1, P2, N1, DY).
    • Statistical evaluation of the relationship between demographic and reproductive factors and parenchymal patterns.

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    Main Results:

    • Parity was significantly associated with a decrease in the frequency of P2 patterns, with each birth increasing the probability of a P2 pattern changing to P1 or N1 by 7-8%.
    • Low body weight was correlated with increased prevalence of dysplasia and prominent duct patterns.
    • Mammographic density declined with increasing age and/or menopause, confirming previous findings.
    • No significant association was found between ethnic group and parenchymal pattern.

    Conclusions:

    • Parity is a significant factor influencing mammographic breast density, leading to less dense patterns (P1, N1) at the expense of denser patterns (P2).
    • Low body weight and menopausal status are also associated with specific mammographic parenchymal patterns.
    • These findings contribute to a better understanding of the determinants of breast density and their implications in mammography.