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

Figure 4

Photomicrograph of the patient’s right axillary sentinel lymph node epithelial inclusion cyst with scattered groups of overtly malignant cells in the cyst lining that were morphologically identical to the patient’s ipsilateral high-grade ductal carcinoma in situ (hematoxylin and eosin (H&E) stain, 600x).