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

Figure 1 Abdominal computed tomography scan findings. Selective coronal views of the abdominal computed tomography scan with intravenous and oral contrast material at 1.3 mm intervals. A solid, heterogeneous, retroperitoneal mass, anterior to the right psoas muscle, posterior to the right kidney, inferior to the right lobe of the liver, extending down to the level of the caecum, and pushing the right kidney anteriorly and laterally, is documented.

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).