Data collected Preoperative data collected included age, body mass indexed (BMI), medical and surgical history, history of chemotherapy, radiotherapy Operative data included estimated blood loss, types of dissection, duration of the operation Postoperative data included hospital stay , postoperative measurement of drainage daily , date of removal , state of the wound ( infection , haematoma, necrosis , opened wound ), number of axillary lymph nodes dissected , cancer stage , number of axillary lymph nodes positive, incidence of Seroma formation , interval of Seroma resolution , Seroma aspirated volume and number of postoperative visits Seroma formation was defined as inability to remove participant drain by postoperative day 10 because of high output (more than 30 ml /day drain Seroma) and / or the need to aspirate of fluid after removal of the drain.