Objective: To evatuate/rewiew the sentinel lymph node practice in the service Patients and methods: it is a descriptive study with retrospective data collection, using exclusively the isotopic method. Patients with tumors less than 5 cm in size, no palpable axillary lymph node, or prior axillary surgery were included. Classified T3, T4 tumors, multifocal and / or multicentric or after neoadjuvant chemotherapy were excluded. Results: Forty patients met the inclusion criteria. Breast–conserving surgery was the practice mostly associated with sentinel lymph node technique: 35/40 (86%) of the cases. On histological analysis of the tumor, invasive ductal carcinoma prevailed with 36/40, (90%) of cases. The sentinel lymph node was positive to tumor cells in 14/40 patients, ie (35% of cases), the isolated tumor cells were not found on any patient, the micro metastases were found for 1case ( 7.1%); on the other hand, macro metastases were diagnosed in 13 patients, ie 92.9% of patients with positive lymph nodes. In patients with positive sentinel lymph node, 4 additional axillary lymph node dissections were performed including 2 patients with 3 positive sentinel lymph nodes and the 2 others with 2 axillary positive node with capsular intrusion. In 10 cases the axillary lymphadenectomy was not performed, among which a case of micro metastasis. Six cases of axillary negative lymph node benefited from complementary axillary lymph node dissection. In all of these cases, there was no lymph node involvement. Conclusion: The Sentinel lymph node technique practice at the Breast Surgery Service of the Rabat National Institute of Oncology is a reality although many are still to be done. The Indications need to be enlarged and the techniques to be diversified.