Ductal Carcinoma Arising in a Squamous Epithelial Inclusion Cyst within an Axillary Lymph Node: A Challenging Nodal Metastasis

Figure 3

Photomicrograph of the patient’s right axillary sentinel lymph node with epithelial inclusion cyst, highlighting positivity of peripheral cyst lining and central keratinous debris (cytokeratin 5/6 immunohistochemical study, 200x).