Fig. 2From: Differentiation of renal angiomyolipoma without visible fat from small clear cell renal cell carcinoma by using specific region of interest on contrast-enhanced CT: a new combination of quantitative toolsThe placement method of ROI (1) and ROI (2). a and b are schematic diagram of blood-rich supply region in the tumor: significantly enhanced region was observed as small patches with unclear boundary at the edge of tumor's parenchyma (red arrow), while tumor vessels presented an arc-shaped linear structure (yellow arrow). (c) is definition method of ROI (1) and ROI (2) based on (a): red ROI is ROI (1), and yellow ROI is ROI (2)Back to article page