ThP1.1 - Unilateral Nipple Discharge: Contemporary Approaches to Investigation and Management across a Multi-site Trust

Abstract Nipple discharge, in the absence of a palpable breast lump, constitutes 3-9% of referrals to breast services[i],[ii]. While the ABS released updated guidelines on nipple discharge in 2019, a standardised management protocol is yet to be established. This study aims to scrutinize the efficacy of imaging (mammogram, USS, MRI) and nipple discharge cytology in predicting malignancy outcomes in patients with unilateral nipple discharge. Aims Determine the incidence of malignancy in women presenting with unilateral nipple discharge. Assess sensitivity, specificity, and positive predictive value of imaging modalities (mammogram, USS, MRI) and cytology. Methodology 110 patients presenting with unilateral nipple discharge between 11/2022-12/2023 were retrospectively analysed. Data encompassing patient demographics, diagnostic procedures, and outcomes were systematically collected. Results 31.6% underwent surgical intervention, revealing a malignancy rate of 5.6%. Positive predictive values for detecting malignancy were 75% for mammogram, 50% for ultrasound, and 66% for nipple discharge cytology. No patients underwent MRI or ductoscopy as part of investigations. Conclusion This study highlights variable diagnostic accuracy of imaging and cytology and the necessity for large-scale collaborative data to draw substantive conclusions. The National Unilateral Discharge Study is anticipated to provide comprehensive insights and contribute to the establishment of a national investigative framework for patients presenting with unilateral nipple discharge. [i] Vargas HI, Romero L, Chlebowski RT. Management of bloody nipple discharge. Curr Treat Options Oncol 2002; 3: 157–161. [ii] Seltzer MH. Breast complaints, biopsies, and cancer correlated with age in 10,000 consecutive new surgical referrals. Breast J 2004; 10: 111–117.