RESUMEN
<p><b>OBJECTIVE</b>To evaluate the technique and significance of mastoscopic axillary sentinel lymph node biopsy.</p><p><b>METHODS</b>Sixty-two patients with breast cancer use methylene blue to test axillary sentinel lymph node. Sentinel lymph node was moved with endoscopy, and endoscopic axillary lymph nod dissection was performed. Pathological examination of sentinel lymph node and axillary lymph node was made with HE. To evaluate detection rate and false negative rate in sentinel lymph node.</p><p><b>RESULTS</b>Among the 62 patients, 61 were confirmed by endoscopic axillary sentinel lymph nod biopsy. Detection rate was 98.4%. Thirty-five cases were no metastasis, 27 cases were metastasis, false negative rate was 0.</p><p><b>CONCLUSIONS</b>Mastoscopic axillary sentinel lymph node biopsy has a high detection rate, good efficiency of cosmetic and lower complications. It has higher sensitivity than traditional axillary lymph nod dissection and provide accurate lymph node stages.</p>