Investigation of the patient with abnormal liver function tests

Area of Science:

• Gastroenterology
• Hepatology
• Oncology

Background:

• Approximately 50% of ulcerative colitis (UC) patients exhibit abnormal liver function tests.
• This necessitates investigation for hepatobiliary diseases, particularly primary sclerosing cholangitis (PSC), which affects 2-10% of UC patients.

Purpose of the Study:

• To review the diagnostic approaches and management strategies for primary sclerosing cholangitis (PSC) in patients with ulcerative colitis (UC).
• To highlight the association between PSC and cholangiocarcinoma and discuss diagnostic challenges and treatment options.

Main Methods:

• Review of diagnostic modalities including endoscopic retrograde cholangiography (ERC) and magnetic resonance cholangiography (MRC).
• Discussion of histopathology, imaging, and endoscopic techniques for differentiating benign and malignant biliary strictures.
• Overview of treatment options such as endoscopic dilation, surgical resection, and liver transplantation.

Main Results:

• Endoscopic retrograde cholangiography is the primary diagnostic tool for PSC, though magnetic resonance cholangiography offers a non-invasive alternative.
• Cholangiocarcinoma complicates 20-40% of end-stage PSC cases, representing a significant cause of mortality in UC patients.
• Distinguishing benign from malignant strictures requires a multimodal approach including clinical assessment, imaging, and tissue sampling.

Conclusions:

• Prompt investigation of abnormal liver function tests in UC patients is essential for early PSC detection.
• Management of PSC and its complications, especially cholangiocarcinoma, requires a tailored approach involving endoscopic, surgical, and transplant interventions.
• Timely diagnosis and intervention can improve the prognosis for patients with PSC and associated biliary strictures.