Figure 6.

A 55-year-old woman with a metastatic solitary fibrous tumor. (a) Axial contrast-enhanced CT image demonstrates large, heterogeneous and hypervascular metastases in the liver (white arrows). (b) Axial contrast-enhanced CT image obtained 12 months after initiating treatment with pazopanib shows progressive decrease in the enhancement of the lesions, which have become almost cystic in appearance (white arrows). (c) Follow-up axial contrast-enhanced CT image 18 months after the start of treatment shows new nodular enhancement within the cystic-appearing lesions (black arrows) termed nodule within a cyst development representative of tumor recurrence according to the Choi criteria.