TFE3 and neoplasm: The tumor in case 1 demonstrated the expected enhancement on contrast imaging, microscopic examination in both cases revealed large polygonal cells with granular eosinophilic cytoplasm separated by small vessels, and immunohistochemical results in each case demonstrated either PAS-positive cytoplasmic crystalline material or TFE-3 nuclear positivity (representing the fusion gene) with most other markers staining negative.