Histopathological features
| Early T cell mediated rejection (TCMR)
| Chronic rejection
| Autoimmune hepatitis (AIH) †
| Hepatitis B / hepatitis C
| Primary biliary cirrhosis (PBC)
| Primary sclerosing cholangitis (PSC) / bile duct (BD) strictures
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Portal inflammation
| Mononuclear with mild rejection; mixed rejection type infiltrate in moderate to severe
| Patchy, mostly lymphoplasmacytic
| More prominent mixed infiltrate with often predominant plasma cell component
| Patchy, nodular aggregates, predominantly mononuclear
| Patchy, with nodular aggregates and granulomas, with bile duct damage, florid duct lesions and lymphocytic cholangitis
| Usually mixed inflammation; can be with neutrophilic component, patchy to diffuse depending on stage
|
Interface activity
| Occasionally present; severity marks higher grade of rejection
| Absent
| Defining feature and usually plasma cell rich with necro inflammation
| Variable, usually not prominent: necroinflammatory and (ductular type)
| Ductular reaction with cholangiolar metaplasia with copper deposition later in disease development
| Ductular reaction with portal and periportal edema
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Bile duct inflammation / damage
| Present and usually involves a majority of bile ducts
| Focal ongoing lymphocytic bile duct damage; inflammation wanes with duct loss
| Variable
| Variable; involves minority of ducts
| Granulomatous or focally severe lymphocytic cholangitis is diagnostic in proper setting
| Periductal lamellar edema, fibrous cholangitis, acute cholangitis, multiple intraportal ductal profiles
|
Bile duct senescence changes / ductopenia
| Absent most cases
| Senescence / atrophy / atypia involve a majority of remaining ducts
| Mostly absent
| Absent in most cases
| Ductopenia with associated with ductular reaction
| Ductopenia associated with ductular reaction
|
Perivenular mononuclear inflammation or hepatocyte dropout
| Variable, if defining feature should involve a majority of perivenular regions; may also show subendothelial inflammation of vein
| Usually present but mostly mild
| Variable, can involve a majority of perivenular regions, similar to rejection; sometimes is plasma cell rich
| Variable, involves minority in most cases
| Variable but generally mild, if present involves a minority of perivenular regions
| Absent
|
Lobular necroinflammatory activity and features
| Variable, if present, more around the perivenular regions
| Variable, if present, more around the perivenular regions
| Disarray variable; variable severity; necroinflammatory activity
| Disarray variable; variable severity; necroinflammatory activity
| Mild disarray, parenchymal granulomas; periportal copper deposition and cholestasis are late features
| Disarray unusual; neutrophils clusters; with or without cholestasis
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Pattern of fibrosis during progression toward cirrhosis
| Rare
| Uncommon, if present usually a venocentric pattern; may evolve to biliary pattern over time
| Usually macronodular, posthepatitic pattern
| Mostly macronodular, hepatitic pattern
| Biliary pattern
| Biliary pattern
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