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. 2013 Nov 16;2013:1534–1543.

Table 1.

Feature Variables Used in Our Study

Feature Variable Instances
Age <46, 46–50, 51–55, 56–60, 61–65, >65
Personal history of breast cancer Yes, no
Family history of breast cancer * None, minor, major
Surgery history of breast cancer Yes, no
Hormone replacement therapy Yes, no
Breast composition ** 1, 2, 3, 4
Mass shape Oval, round, lobular, irregular, missing
Mass stability Decreasing, stable, increasing, missing
Mass margin Circumscribed, ill defined, microlobulated, speculated
Mass density Fat, low, equal, high, missing
Mass size None, small (<3 cm), large (>3 cm)
Lymph node Present, not present
Asymmetric density Present, not present
Tubular density Present, not present
Skin retraction Present, not present
Nipple retraction Present, not present
Skin thickening Present, not present
Trabecular thickening Present, not present
Skin lesion Present, not present
Axillary adenopathy Present, not present
Architectural distortion Present, not present
Calcifications
  Popcorn Present, not present
  Milk of calcium Present, not present
  Rod-like Present, not present
  Eggshell Present, not present
  Dystrophic Present, not present
  Lucent Present, not present
  Dermal Present, not present
  Round Scattered, regional, clustered, segmental, linear ductal
  Punctate Scattered, regional, clustered, segmental, linear ductal
  Amorphous Scattered, regional, clustered, segmental, linear ductal
  Pleomorphic Scattered, regional, clustered, segmental, linear ductal
  Fine linear Scattered, regional, clustered, segmental, linear ductal
*

minor = non-first-degree family member(s) with a diagnosis of breast cancer, major = one or more first-degree family member(s) with a diagnosis of breast cancer.

**

1 = predominantly fatty, 2 = scattered fibroglandular, 3 = heterogeneously dense, 4 = extremely dense.