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CT during arterial portography: diagnostic pitfalls.
R C Nelson1, G H Thompson, J L Chezmar
1Department of Radiology, Emory University Hospital, Atlanta, GA 30322.
Summary
Computed tomography during arterial portography (CTAP) can misidentify non-tumorous liver perfusion abnormalities as tumors. Understanding these CTAP pitfalls is crucial for accurate hepatic tumor resection evaluation.
Area of Science:
- Hepatobiliary imaging
- Abdominal radiology
- Surgical oncology
Background:
- Computed tomography during arterial portography (CTAP) is vital for liver evaluation before hepatic tumor resection.
- Typically, liver tumors appear as low-attenuation lesions on CTAP compared to enhancing parenchyma.
- However, distinguishing true tumors from perfusion abnormalities is critical.
Purpose of the Study:
- To categorize common perfusion abnormalities encountered during CTAP.
- To highlight potential diagnostic pitfalls that may mimic tumors.
- To emphasize the importance of recognizing these non-tumorous findings for accurate surgical candidate selection.
Main Methods:
- Review of CTAP imaging characteristics of liver lesions.
- Categorization of perfusion abnormalities based on imaging patterns.
- Discussion of adjunctive imaging modalities for improved characterization.
Main Results:
- Low-attenuation lesions on CTAP may represent perfusion abnormalities, not tumors.
- These abnormalities include technique-related defects, straight-line sign, perihilar/periligamentous changes, subcapsular defects, and cirrhosis-related changes.
- Adjuvant techniques like delayed CT, MRI, and intraoperative ultrasound aid in differentiation.
Conclusions:
- Accurate hepatic tumor resection evaluation requires awareness of CTAP diagnostic pitfalls.
- Recognizing perfusion abnormalities prevents misdiagnosis and ensures appropriate patient management.
- Knowledge of imaging characteristics of non-tumorous defects improves diagnostic specificity.