Bilateral Bloody Nipple Discharge in a Primigravid Patient: A Benign Presentation Mimicking Pathology.

Bloody nipple discharge during pregnancy is a rare clinical finding that often causes significant anxiety for both the patient and the clinician. Bloody nipple discharge usually raises suspicion of malignancy or intraductal papilloma. However, it can occur as a benign, self-limiting physiological process during pregnancy due to increased breast vascularity and epithelial proliferation (rusty pipe syndrome). We report a case of a 31-year-old primigravid woman at 16 weeks' gestation presenting with bilateral, spontaneous, multi-duct bloody nipple discharge without associated palpable masses or breast pain. Breast ultrasound revealed no pathological findings, demonstrating normal pregnancy-related parenchymal changes without focal lesions, and cytology confirmed benign findings. Cytology played a supportive, not diagnostic, role because of its relatively low sensitivity. The patient was managed conservatively with close clinical surveillance. Symptoms remained stable throughout the gestational period and resolved spontaneously 10 days postpartum. This case highlights the importance of recognizing benign causes of bloody nipple discharge in pregnancy and supports a non-invasive, stepwise diagnostic approach (triple assessment) to avoid unnecessary invasive interventions in the pregnant patient while ensuring patient safety.