Incidental Monotypic (Fat-Poor) Renal Angiomyolipoma Diagnosed by Core Needle Biopsy
Figure 2
Representative findings of the kidney biopsy (a) with the angiomyolipoma (b–e). (a) Light microscopy of the kidney, hematoxylin stain (magnification ×4). (b) Light microscopy of the angiomyolipoma, hematoxylin stain (magnification ×100). (c) Higher magnification of the tumor showed large spindled and epithelioid cells with clear and eosinophilic cytoplasm intimately associated with slit-like vascular channels, (magnification ×400). (d) Immunohistochemistry using an antibody against actin (magnification ×100) shows a strong positivity of the smooth muscle component of the tumor. (e) Immunohistochemistry using an antibody against HMB-45 (magnification ×100) shows a few positive tumor cells.
