Hepatic imaging following intra-arterial embolotherapy
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Abstract
Purpose
To discuss guidelines and salient imaging findings of solid tumors treated with common intra-arterial procedures used in interventional oncology.
Methods
A meticulous literature search of PubMed-indexed articles was conducted. Key words included “imaging + embolization,” “imaging + TACE,” “imaging + radioembolization,” “imaging + Y90,” “mRECIST,” and “EASL.” Representative post-treatment cross-sectional images were obtained from past cases in this institution.
Results
Intra-arterial therapy (IAT) in interventional oncology includes bland embolization, chemoembolization, and radioembolization. Solid tumors of the liver are the primary focus of these procedures. Cross-sectional CT and/or MR are the main modalities used to image tumors after treatment. Traditional size-based response criteria (WHO and RECIST) alone are of limited utility in determining response to IAT; tumoral necrosis and enhancement must be considered. Specifically for HCC, the EASL and mRECIST guidelines are becoming widely adopted response criteria to assess these factors. DWI, FDG-PET, and CEUS are modalities that play an adjunctive but controversial role.
Conclusions
Radiologists must be aware that the different forms of intra-arterial therapy yield characteristic findings on cross-sectional imaging. Knowledge of these findings is integral to accurate assessment of tumor response and progression.
Keywords
Computed tomography (CT) HCC Intra-arterial embolotherapies Modified RECIST (mRECIST) MR imaging Response assessmentAbbreviations
- AASLD
American Association for the Study of Liver Disease
- ADC
Apparent diffusion coefficient
- AFP
Alpha-fetoprotein
- CEUS
Contrast-enhanced ultrasonography
- CT
Computerized tomography
- cTACE
Conventional trans-arterial chemoembolization
- DEB-TACE
Drug-eluting bead trans-arterial chemoembolization
- DECT
Dual-energy computerized tomography
- DWI
Diffusion weighted imaging
- EASL
European Association for the Study of Liver
- FDG-PET
Fluorodeoxyglucose-positron emission tomography
- HCC
Hepatocellular carcinoma
- IAT
Intra-arterial therapy
- LRT
Locoregional therapy
- mCRC
Metastatic colorectal carcinoma
- MDCT
Multi-detector computed tomography
- mRECIST
Modified response evaluation criteria in solid tumors
- MRI
Gadolinium-enhanced magnetic resonance imaging
- qEASL
Quantitative European Association for the Study of Liver
- RECIST
Response Evaluation Criteria in Solid Tumors
- ROI
Region of interest
- TACE
Trans-arterial chemoembolization
- TAE
Trans-arterial embolization
- TARE
Trans-arterial radioembolization
- UNOS
United Network for Organ Sharing
- WHO
World Health Organization
- vRECIST
Volumetric Response Evaluation Criteria in Solid Tumors
- Y90
Yttrium-90
Notes
Compliance with ethical standards
Conflict of Interest
RJL and RS are advisors to BTG international. None of the other authors report a conflict of interest.
Ethical approval
This article does not contain any studies with human participants or animals performed by any of the authors.
Funding
There was no funding provided for this study.
Informed consent
Institutional Review Board approval was obtained for cross-sectional imaging included in this review. For this type of study, formal consent is not required.
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