Liver, biliary and pancreatic pathology Flashcards
Chronic liver disease lasted ___
Must have +
> 6 months
stellate activation and cirrhosis
4 types of liver cells:
hepatocytes
Kupffer cells
endothelial cells of fenustrates
stellate cells
hepatic macrophages that breakdown RBCs
Kupffer cells
function of hepatocytes near artery = \_\_ near central vein = \_\_\_
artery = metabolic processes
central vein = toxin clearance
normally stellate cells are ___ and function =__
quiescent
store fat, vit. A and control sinusoid blood flow
Damage to the liver causes loss of ___ on hepatocytes, ___ activate, ___ are lost from epithelial cells and __ cells are activated
hepatic microvilli
Kupffer cells
fenustrates
Stellate
Liver damage=>
activated stellate cells: proliferate, become more ___, attract ___ and chemotaxis of __ => extracellular matrix degradation and ___ laid down = ___=>
contractile
leukocytes
stellate cells
collagen = fibrogenesis=> cirrhosis
Liver damage:
Causes stellate apoptosis which => ___
TIMP - tissue inhibitor of metalloproteases
resolution
What activates Kupffer cells?
product of damaged cells
activation factors eg. TGFB1, PDGF …
Can diagnose steatosis by
US
2 hit theory for NASH:
1= too many tri.s to store = free FAs 2= ox. stress + lipid peroxidation due to MCD diets/pro-inflam cytokine release = reperfusion injury
Autoimmune disease characterised by +AMA antibodies, T cell CD4 mediated against intra-hepatic bile ducts, mostly in women
PBC (primary biliary cirrhosis)
Autoimmune hepatitis is more common in M/F?
females 4:1
Histology of autoimmune hepatitis shows:
piecemeal necrosis
interface hepatitis
numerous plasma cells
Type 2 AI hepatitis is more/less common than type one
Occurs usually in ___
+AI antibodies =
more
young adults / children
AMA, LKM-1
Type 1 AI hepatitis is associated with which +AI antibodies
ANA, ASMA, SLA(marks severity), IgG, AMA, pANCA
Diagnosis of AI hepatitis is based on which investigations?
increased AST and ALT in LFTs
Increased IgG, AI Igs
liver biopsy
treatment of AI hepatitis =
corticostreoids - prednisolone (start high dose then lower to maintenance dose)
azathioprine
PSC is more common in M/F? \+antibodies? is AI destruction of \_\_\_ image of biliary tree shows \_\_\_ associated with \_\_\_
M 4:1 ANCA mainly large and medium intra and extrahepatic bile ducts onion skinning/ beading of biliary tree UC
PBC or PSC increases risk of cholangiocarcinoma
If also have UC it increases risk of ___ too
PSC
colorectal carcinoma
Haemochromatosis=
autosomal recessive disease of Fe overload
___ mutations in __ gene =>___
In haemochromatosis
C282Y/H63D
HFE gene
=> liver doesnt signal enterocyte to stop absorbing Fe
bronzed diabetic has…
haemochromatosis
treatment of haemochromatosis =
venesection