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Challenges in Diagnosing and Reporting Cholangiocarcinoma
Tony El Jabbour1, Attila Molnar2, Stephen M Lagana3
1West Virginia University.
Surgical Pathology Clinics
|August 3, 2023
Summary
Intrahepatic cholangiocarcinoma presents diagnostic challenges for pathologists due to its rarity and mimicry by metastatic cancers. Distinguishing it requires careful morphologic assessment, as immunohistochemistry is often unhelpful.
Area of Science:
- Pathology
- Surgical Pathology
- Hepatobiliary Pathology
Background:
- Intrahepatic cholangiocarcinoma (ICC) is a rare liver cancer.
- ICC poses diagnostic challenges for practicing surgical pathologists.
- Morphological similarity to metastatic tumors (e.g., pancreatic adenocarcinoma) complicates diagnosis.
Purpose of the Study:
- To discuss the diagnostic challenges of intrahepatic cholangiocarcinoma.
- To highlight issues relevant to practicing surgical pathologists.
- To review differential diagnoses and challenging morphologic features.
Main Methods:
- Review of morphologic features of ICC.
- Discussion of differential diagnoses, including metastatic tumors.
- Consideration of combined hepatocellular carcinoma and cholangiocarcinoma.
Main Results:
- ICC is morphologically diverse, with small duct and large duct variants.
- Metastatic tumors can mimic ICC, and immunohistochemistry is often uninformative.
- Combined hepatocellular carcinoma and cholangiocarcinoma presents additional diagnostic complexity.
Conclusions:
- Intrahepatic cholangiocarcinoma diagnosis requires expertise in liver pathology.
- Pathologists must be aware of mimickers and challenging presentations.
- Careful morphologic evaluation is crucial for accurate ICC diagnosis.
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