Fig. 1

Contrast-enhanced computed tomography (CT) findings. CT showed a relatively clear, round, ring-enhanced tumor of 15 mm in diameter (white arrow) and an adjacent tumor of 35 mm in size (yellow arrow) (a). The larger tumor was enlarged compared with 1 month before (b) and had not been recognized 6 months previously (c). The smaller tumor had not changed from 3 years previously (d)