Breast Metastasis of Primary Pulmonary Adenocarcinoma: A Report of Two Cases and Literature Review

• DUAN Liqun, 
• BI Jianping, 
• LI Yanping, 
• ZHANG Yong, 
• WANG Mingwei, 
• SUN Wenjia, 
• HU Desheng, 
• PI Guoliang