Biliary Tract Diseases

Reference: Davidson 23rd; P-889
Explanation: On liver biopsy, the characteristics early features of PSC are periductal ‘onion skin’ fibrosis and inflammation.

Reference: Davidson 23rd; P-862
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Reference: Davidson 23rd; P-886, box: 22.50

Reference: Davidson 23rd; P-861
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

On liver biopsy, the characteristic early features of PSC are periductal ‘onion skin’ fibrosis and inflammation, with portal oedema and bile ductular proliferation resulting in expansion of the portal tracts (Fig. 24.34). Later, fibrosis spreads, progressing inevitably to biliary cirrhosis; obliterative cholangitis leads to the so-called ‘vanishing bile duct syndrome’.

Stem Breakdown:

Chronic fatigue, pruritus (itching), and dry eyes: These are common symptoms in cholestatic liver disease, particularly in autoimmune liver conditions.
Isolated elevation in ALP: Alkaline phosphatase elevation suggests cholestasis, where bile flow is impaired, leading to liver dysfunction.
Positive antimitochondrial antibodies (AMA): This is the hallmark serological finding in primary biliary cholangitis (PBC).
Option Analysis:

A) Primary biliary cholangitis (PBC): This is the correct diagnosis. Davidson explains that PBC is an autoimmune disorder characterised by chronic inflammation and destruction of small bile ducts in the liver. The presence of AMA is highly specific for PBC, and ALP is typically elevated due to cholestasis. Harrison notes that PBC often presents with fatigue and pruritus and is associated with other autoimmune conditions like Sjögren's syndrome (dry eyes).
B) Autoimmune hepatitis: Autoimmune hepatitis typically presents with elevated aminotransferases (ALT/AST) and is associated with autoantibodies such as ANA or SMA, not AMA. It does not cause isolated cholestasis.
C) Primary sclerosing cholangitis (PSC): PSC is another cholestatic liver disease, but it is associated with inflammatory bowel disease (usually ulcerative colitis) and typically shows beading of the bile ducts on imaging. AMA is negative in PSC.
D) Hepatitis C: Chronic hepatitis C can cause liver damage, but it usually presents with elevated ALT/AST rather than isolated ALP elevation, and it is not associated with AMA positivity.