Fig 2. A 25-year-old female patient with a history of colorectal cancer presented multiple liver lesions after surgery.

The FNH in the right liver shows an arterial contrast-agent enhancement (A) and is still hyperintense in the liver-specific contrast phase (C). No significant ¹⁸F-FDG-uptake is seen (B, D). A second lesion in the right liver is rated as a colorectal liver metastasis due to incomplete resection. Tumor lesion is neither detectable by MRI without liver-specific contrast phase nor with liver-specific contrast phase (E; G). In fused PET/MR images (F; H) the remaining tumor tissue lesion could clearly be identified. Additional lesions near the liver hilus are adenomas with strong arterial contrast-agent enhancement (I). In the liver-specific contrast phase lesions are hypointense (K). Similar to the FNH, no significant ¹⁸F-FDG-uptake is seen (J, L).