Figure 5 Histopathological findingsThe biopsy specimen had a structure consistent with a cyst wall composed of thick fibrous connective tissue, with no definitive atypical tumor cells (A, hematoxylin and eosin [H&E] stain, × 100) (bar, 200 μm). There are numerous hemosiderin-laden macrophages on the surface of, and within, the fibrous connective tissue, which are presumed to represent the cyst wall (B, H&E stain, × 200) (bar, 100 μm). Surgical specimens reveal multiple multilocular cysts containing hemorrhagic components. In addition, areas with hemangioma-like architecture and regions have solid proliferation of tumor cells (C, H&E staining, × 40) (bar, 500 μm). There are markedly atypical tumor cells lining the vascular-like spaces are at the periphery of the hemangioma-like structures (D, H&E stain, × 200) (bar, 100 μm).