INTRODUCTION
Multiple primary malignant tumors present as two or more primary tumors of different origins in a single person. This condition is rare and infrequently reported, with an incidence of 0.73–11.7% in cancer patients.1 Synchronous cancers are defined as those occurring within 6 months of the first primary cancer, whereas metachronous cancers are those occurring 6 months later.2 Synchronous cancers reportedly have an incidence of 1.7% for breast cancer.3 Concomitant surgery was performed within 2 weeks in our case since the patient was diagnosed with triple primary tumors of synchronous type. We then recorded the surgical outcome and conducted a follow-up for approximately 3 months. Following surgery, the patient underwent chemotherapy three times in a disease-free situation.