Retroperitoneal perivascular epithelioid cell tumours: A case report and review of literature

Figure 2 Histology and immunohistochemical analysis. A: Encapsulated tumour composed of eosinophilic cells. Thin-walled and ectatic vessels are also apparent. Part of the tumour capsule is seen in the upper left of the picture (haematoxylin and eosin staining; magnification × 10). B: Polygonal or spindle cells, with eosinophilic cytoplasm and mildly atypical nuclei arranged in short bundles, around compressed, thin-walled vascular channels (haematoxylin and eosin staining; magnification × 40). C: Diffuse smooth muscle actin reactivity (magnification × 10). D: Focal human melanoma black-45 reactivity (magnification × 10).