Table 2 Final diagnosis for the additional lesions as assessed by reference standards

Benign lesions

35 (85%)

 Non-specific benign findings^a

28

 Fibroadenoma

4

 Benign intramammary lymph node

2

 ADH

1

Malignant lesions

6 (15%)

 Side

  Right

6

Location of additional malignant lesion relative to index malignant lesion(s)

  Same breast same quadrant^b

3

  Same breast different quadrant^c

3

 Pathological features

  Invasive breast cancer

3

   IDC

1

   IDC and DCIS

1

   IDC and ILC with DCIS

1

 Histopathological Features

  Grade 2

3

  Luminal A

2

  Luminal B

1

 Malignant intramammary lymph node

1

  DCIS only

2

   High grade

1

   Low grade

1