Middle Mediastinal Mass Compressing the Pulmonary Trunk in a Patient With a History of Breast Cancer.

A 61-year-old White woman, nonsmoker, was referred to Respirology for evaluation of small pulmonary nodules discovered incidentally on surveillance imaging 3 years after breast cancer treatment. She had a remote left breast ductal carcinoma in situ treated with lumpectomy followed by radiation therapy, and recurrent stage 1 breast cancer (estrogen receptor/progesterone receptor-positive, human epidermal growth factor receptor 2-negative) treated with mastectomy, axillary lymph node dissection, and reconstructive surgery, followed with adjuvant chemotherapy, radiation therapy, and letrozole maintenance. Her other medical conditions included compensated cirrhosis secondary to nonalcoholic fatty liver disease, type 2 diabetes, hypertension, OSA, restless legs syndrome, obesity, anxiety, and depression. She reported no dyspnea or constitutional symptoms.