Figure 1

Left kidney mass. (A) Computed tomography scan showing a heterogeneous hypo-dense mass in the left kidney measuring 73×66×65mm across its maximal dimensions (crossing yellow bars). A 35mm simple cyst is present in the right kidney. (B) Microscopic image from hematoxylin and eosin sections of the epithelioid variant of angiomyolipoma tumor showing sheets of pleomorphic, round to polygonal epithelioid cells, with prominent eosinophilic cytoplasm, large nuclei, many of them multinucleated, and with very prominent nucleoli; some interspersed smooth muscle fibers were present but no adipocytes were identified (40× objective). Microscopic images from the renal epithelioid angiomyolipoma with immunoperoxidase stainings showing positive reactivity for calponin (C), CD68 (D), smooth muscle actin (E), and negative reactivity for HMB45 (F) (all at 40× objective).