Core Needle Biopsy and Preoperative Risk Factors as Predictors of Upstaging Atypical Ductal Hyperplasia on Surgical Excision

= .03). At a median follow-up of 52.5 months, 21 (4.6%) patients developed subsequent DCIS, and 20 (4.4%) patients developed subsequent invasive cancer.ConclusionADH on CNB was upstaged on surgical excision in 24.1% of patients. Multifocal ADH and abnormal MRI findings strongly predict upstaging to malignancy. The 9.6% rate of subsequent malignancy necessitates long-term surveillance for all patients with ADH.