Computed tomography-guided percutaneous biopsy for assessing tumor heterogeneity in neuroendocrine tumor metastases to the liver

Figure 1 Computed tomography-guided biopsy of a pancreatic neuroendocrine tumor liver metastasis. A: Axial contrast-enhanced computed tomography (CT) reveals an arterially enhancing 45 cm lesion in the right lobe of the liver (arrow); B: Axial contrast-enhanced CT reveals an artery nearby the lesion (arrow); C: Axial contrast-enhanced CT reveals a portal vein nearby the lesion (arrow); D: Procedural non-enhanced CT image at the same cross-sectional level reveals the lesion to be hypoattenuating to the liver; E: 17-gauge introducer needle (arrow) was placed in approximate location of the lesion based on the avoidance of damage to artery within the liver and portal vein; F: Post-procedural non-enhanced CT image reveals no complications.