Summary: calretinin (positive stain) is nearly a definitive pattern, but it must be emphasized that no single IHC stain can make the final diagnosis of mesothelioma versus carcinomatosis (Fig 7). Fig 7. Epithelial mesothelioma. High magnification of tumor cells with strong positive expression for calretinin (calretinin; original magnification x 500).
Image Dimensions: 412 x 274
Image originally found here.