Unexpected contralateral axillary lymph node metastasis without ipsilateral involvement in triple-negative breast cancer: A case report and review of literature

Figure 4 H&E stain of the main tumor and the right axillary lymph node and immunohistochemical stain of the right axillary lymph node. A: H&E stain of the main tumor with magnification 100 ×. An invasive carcinoma consists of tumor cells with nuclear pleomorphism and high N/C ratio, arranged in distorted glandular to solid nested patterns, infiltrating to the fibrous stroma and adipose tissue; B and C: H&E stain of the right axillary lymph node with magnification 100 × (B) and 200 × (C). Follicular structure of normal lymphoid tissue is effaced by solid nested tumor cells with nuclear pleomorphism; D: Immunohistochemical stain of the right axillary lymph node with magnification 100 ×. Mammary origin of metastatic tumor is identified with positive GATA3. R’t LN: Right lymph node.