OBJECTIVES: The study objectives were to research the number of sentinel lymph node scintigraphies provided at Clinical Institute of Nuclear Medicine and Radiation Protection of KBC Osijek in the past two years, to calculate the percentage of lymphoscintigraphies in malignant breast cancer in total number, to determine the connection between sex and age of the patients, local drainage pathways and the number of detected lymph nodes. STUDY DESIGN: Cross-sectional study with historical data. MATERIALS AND METHODS: The subjects were patients who underwent sentinel lymph node scintigraphy at Clinical Institute of Nuclear Medicine and Radiation Protection of KBC Osijek in the period from November 2018 to November 2020. The data was collected from the archives of medical records. The collected data was age and sex of patients, the total number of lymphoscintigraphies performed, the number of lymphoscintigraphies performed in malignant breast cancer, the number and location of sentinel lymph node. Sentinel lymph node scintigraphy was performed using Tc-99m-Nanocoll on Siemens e-Cam, and scintigrams were processed using SyngoMI VA50B and Xeleris. RESULTS: From the total number of subjects 115 (91 %) patients with malignant breast cancer underwent lymphoscintigraphy. There were 98,3 % female patients and 1,7 % male patients. The arithmetic mean age of the patients was 60,4 years with standard deviation of 11,6 years. In most cases sentinel lymph nodes occur in the left or right axillary region and in 70 cases one sentinel lymph node is detected. CONCLUSION: Only in one case out of 115 there was no sentinel lymph node detected. The analysis of the obtained values, with regard to gender, were mostly female patients, 113 of them, with regard to age, 64 patients were between 50 and 69 years, with regard to localization of sentinel lymph node, most of them were detected in the left and right axillary region.