Right Atrial Mass in a 63-Year-Old Woman.

A 63-year-old woman presented to the emergency room with sudden-onset abdominal pain and vomiting. She had a medical history of estrogen receptor/progesterone receptor positive-, human epidermal growth factor receptor 2-negative breast intraductal carcinoma status after partial mastectomy with adjuvant radiation on hormone-based chemotherapy. Presenting vital signs included a heart rate of 80 beats/min, BP of 149/84 mm Hg, and 94% oxygen saturation on room air.