Non-histopathological parameters associated with upgrade of breast tumours yielding a core biopsy report of histological grade 2 ductal no special type to grade 3 on excision.

Oncologists and surgeons should be aware that lesions with a core biopsy diagnosis of grade 2 IDC-NST measuring over 15 mm on US have a 37% chance of being grade 3 on excision and this should be considered when deciding pre-operative management.