Rationale: Autoimmune hepatitis (AIH) is characterised by interface hepatitis. However, some acute cases exhibit atypical centrilobular necrosis with mild portal inflammation. Detailed histological and ultrastructural analyses of acute AIH are limited.
Patient concerns: A 44-year-old female was admitted to our hospital with jaundice, general fatigue and liver dysfunction. Her transaminase levels were elevated, her immunoglobulin G level was 1735 mg/dL and her anti-nuclear titres were ×80.
Diagnosis: AIH was diagnosed, and histochemical examination of a liver biopsy showed the presence of atypical histological features of prominent centrilobular necrosis and central vein and hepatic sinusoidal endotheliitis. Electron microscopy showed that dendritic cells (DCs) and lymphocytes were attached to disrupted liver sinusoidal endothelial cells (LSECs) in hepatic sinusoids and that DCs attached to LSECs via pseudopods in the central vein.
Interventions and outcomes: The patient was started on 40 mg/day prednisolone to control the hepatic inflammation. Her aspartate and alanine aminotransferase levels started declining after prednisolone was initiated. Three weeks later, these levels had normalised. The dosage of prednisolone was gradually decreased as liver function improved. The patient remains under observation and continues to receive 2.5 mg prednisolone.
Lessons: An important marker of acute AIH may be the presence of activated DCs in the hepatic sinusoids and central vein.