Clinical approach to indeterminate biliary strictures: Clinical presentation, diagnosis, and workup

Figure 5 Biliary stricture biopsy. A: Microscopic examination (hematoxylin and eosin) reveals medium sized malignant cells arranged in clusters and single cell units. Tumor cells are diffusely distributed in an inflamed desmoplastic stroma; B: Immunostaining for CK7 performed on the biopsy specimen is positive in tumor cells with appropriate control.