Are liver nested stromal epithelial tumors always low aggressive?

Figure 1 Computer tomography examination and virtual resection. A: Pre-contrast acquisition, axial image cranial to the hilar plane showing a large, hypo-attenuating lobulated lesion involving the right hemi-liver and part of the segment 4 (white circle: calcification within the neoplastic lesion); B and C: Axial images across the hilar plane during arterial (B) and portal (C) phase. Then neoplastic, lobulated lesion shows early arterial enhancement resulting in hypo-attenuation during the portal phase. The right portal branch is not visible due to neoplastic infiltration (white arrows); D-F: Virtual resection, volume renderings of CT images; D: Total liver volume; the non-homogenous red color of the right hemi-liver corresponds to the lesion (black arrows); E: Tumor lesion; F: Future remnant liver corresponding to segments 2 and 3.