histo GIT COPY Flashcards
classification of GORD
Los angeles classification
changes seen in Barrett’s oesophagus
squamous metaplasis of columnar cells to goblet cells SCJ moves upwards
cancer seen in barrett’s oesophagus
adenocarcinoma
normal site of gastric adenocarcinoma
distal third of oesophagus
risk factors for oesophageal adenocarcinoma
obesity prior radiation therapy m>f smoking
squamous cell oesophageal carcinoma risk factors
ETOH smoking achelasia of cardia plummer-vinson syndrome HPV afrocarribean
locations of squamous cell oesophageal carcinoma
middle third of stomach
presentation of squamous cell carcinoma
progressive dysphagia anorexia weight loss early mets
varices
engorged veins due to portal hypertension
treatment of varices
sclerotherapy banding
acute phase of gastritis is mediated by
neutrophils
chronic phase of gastritis mediated by
lymphocytes
causes of acute gastritis
NSAIDS, aspirin, H pylori, burns, bleach
causes of chronic gastritis
pernicious anaemia, H pylori, ETOH, smoking
definition of gastric ulcer
breach of muscularis mucosa into submucos
symptoms of gastric ulcer
pain with food epigastric pain weight loss
triple therapy for H pylori
PPI clarithromycin amoxicillin/ metronidazole
causes of gastric lymphoma
chronic antigen stimulation
symptoms of duodenal ulcer
epigastric pain at night relieved by food and milk
risk factors for duodenal ulcer
h pylori aspirin NSAIDS steroids smoking drugs acid secretion
complication of duodenal ulcer
perforation- check with cxr
coeliac disease HLA associations
HLA DQ2, DQ8
pathology of coeliac disease
villous atrophy
symptoms of coeliac disease
dermatitis herpetiformis, abdo pain, bloating, steathorrea, n&v, failure to thrive, reduced weight
buzzwords for coeliac
irish woman
SEROLOGICAL TESTS FOR COELIAC DISEASE
anti-endomysial antibody (best) anti- tissue transglutaminase anti-gliadin
what antibody is anti-TTG
igA
gold standard investigations for coeliac disease
upper GI endoscopy duedenal biopsy
what is seen on duedenal biopsy in coeliac disease
villous atrophy crypt hyperplasia lymphocyte infiltrate
congenital gastric disorders
atresia stenosis duplication imperforate anus hirschsprung’s disease
`pathology of hirschsprungs disease
absence of ganglion cells in myenteric plexus
what is hirschsprungs disease associated with
down’s (2%) m>f RET on chromosome 10
treatment of hirschsprung’s disease
resection
causes of mechanical obstruction of GIT
volvulus adhesions herniation diverticulitis external mass e.g. aneurysm foreign body intusseption CONSTIPATION
define volvulus
complete twisting of bowel loop at mesenteric base around vascular pedicle
how does area of volvulus vary between children and adults
sigmoid in paeds caecal in older adults
causes of acute colitis
infection chemo antibiotics
causes of chronic colitis
IBD TB
ischaemic colitis definition
small vessel occlusion
pathology of crohns disease
skip lesions affects mouth to anus healthy mucosa above diseased mucosa non-caseating granulomas transmural inflammation
symptoms of crohns disease
apthous ulcers deeper rosethorn ulcers
symptoms of crohns disease
intermittent diarrhoea pain and fever
pathology of ulcerative colitis
superficial broad ulcer continuous mucosal involvment
symptoms of ulcerative colitis
bloody diarrhoea with mucuc crampy abdo pain relieved by defecation
pathological features of UC
islands of regenerating mucosa bulge into lumen forming pseudopolyps
what is backwash ileitis
severe pancolitis
IBD extra GI manifestions
uveitis stomatitis erythema nodosum pyoderma gangrenosum erythema muliforme sacroileitis PSC pericholangitis
UC complications
toxic megacolon 20-30x risk of adenocarcinoma haemmorhage
CD complication
abscess fistulae perforation scrictures
investigations for CD
inflammatory markers barium swallow endoscopy
UC investigations
rectal biopsy flexible sig/colonoscopy stool culture AXR
management of CD
mild: prednisolone severe IV hydrocortisone adjuncts: azothioprine, methotrexate, inflicimab
managment of mild UC flare
prednisolone and mesalazine
management of moderate UC flare
prednisolone plus mesalazine and steroid enema BD
management of severe UC flare
abmit NBM IV fluids IV hydrocortisone rectal steroids
treatment for remission of UC
5-ASA second line azothiprine
how to diagnose c diff
stool culture
treatment of c diff
metronidazole second line is vancomycin
where does diverticular disease usually occur
left colon
how to diagnose diverticular disease
barium enema CT or endoscopy
pathology of diverticular disease
high intrluminal pressure causes outpouching of the gut wall at weak points
triad of carcinoid syndrome
flushing, diahorrea, bronchoconstriction
what cell type gives rise to tumours that cause carcinoid syndrome
enterchomaffrin cells
what do tumours produce in carcinoid syndrome
serotonin
where are tumours causing carcinoid syndrome normally found
bowel, (also lung, testes and ovary)
what occurs in carcinoid crisis
hypotension tachycardia life threatening vasodilation bronchoconstriction hyperglycaemia
investigations for carcinoid syndrome
24 hour urinary 5-HIAA (serotonin metabolite)
treatment of carcinoid syndrome
octreotide
types of colonic adenoma
tubular, tubulovillous, villous
complication of villous adenoma
hypoproteinaemic hypokalaemia secrete protein and potassium
risk factors for malignancy
size degree of dysplasia and villous content
what mutation causes FAP
APC gene
progression of colon cancer
APC- KRAS mutation- loss of function of P53
what is a juvenile polyp
hamartous polyp focal malformation of mucosa and lamina propria
how is juvenile polyposis inherited
autosomal dominant
mutation i nPeutz-jeghers syndrome
LKB1
inheritance of peutz-jeghers syndrome
autosomal dominant
symptoms of peutz-jeghers syndrome
freckles around mouth, palms and soles mucocutaneous hyperpigmentation
complications of peutz jeghers syndrome
malignancy intusseption
what is a hyperplastic colonic polyp
shedding of endothelium seen in elderly cell buildup
three types of colonic polyp
inflammatory hamartomatous hyperplastic
symptoms of left sided colon cancer
crampy LLQ pain change in bowel habit
symptoms of right sided colon cancer
IDA weight loss
what sort of tumours occur in the colon
adenocarcinoma
investigations for bowel cancer
proctoscopy, sigmoidoscopy, colonoscopy, barium enema, FBC
how can you monitor disease in colorectal cancer
carcinoembryonic antigen (CEA)
what classification system is used for colorectal cancer
Dukes
what is Dukes A in colorectal cancer
confined to mucosa
what is dukes C in colorectal cancer
in muscularis propria
how to treat CRC in lower third of rectum
abdomino-perineal resection
how to treat CRC >1 cm above anal sphincter
anterior resection
how to treat sigmoid cancer
sigmoid colectomy
how to treat cancer in descending colon/ distal transverse
left hemicolectomy
how to treat caecal, ascending colon or proximal transverse colon cancer
right hemicolectomy
palliative chemo in colorectal cancer
5FR
treatment of CRC
surgery and radiotherapy
where is the APC gene located in FAP
chromosome 5q1
inheritance of FAP
autosomal recessive
what is gardner’s syndrome
FAP + dental caries + osteoma
extra sign in FAP
hypertrophy of retinal pigment epithilium
pathology of lynch syndrome
autosomal dominant mutation of DNA mismatch repair gene
pathophysiology of lynch syndrome
malignant tumour in right colon
associations of lynch syndrome
bowel, ovarian, endometrail, transitional and stomach carcinoma
what stimulates the pancreas to produce enzymatic/ bicarbonate rich fluid
CCK and secretin
what does CCK do
stimulates digestion of fat and protein by causing release of digestive enzymes
where is CCK produced
I cells of the duedenum
where is secretin produced
s cells of duodenum
what does secretin do
controls gastic acid secretion and buffering with HCO3
what do the alpha cells of the pancreas do
produce glucogon
what does glucogon do
increases blood glucose levels
what do the beta cells of the pancreas do
produce insulin to reduce blood glucose levels
what do the delta cells of the pancreas do
produce somatostatin
what does somatostain do
regulates pancreatic beta cells
what is D1 (pancreas)
vasoactive peptide to stimulate uptake of H2O into the pancreatic system
what is PP (pancreas)
pancreatic polypeptide (self regulates pancreatic secretions)
metabolic syndrome
dyslipidaemia -HDL<1mmol/L, TGs >2 hypertension >140/90 waist circumference >94 men, 80 women fasting hyperglycaemia >6mmol microalbuminaemia
what destroys pancreatic cells in diabetes mellitus
CD4 and CD8
limits of BGL for diabetes
>6mmol/L fasting >11.1 mmol/L random
microvascular complications of diabetes
PVD retinopathy
macrovascular complications of diabetes
MI, glomerulonephritis, CVA
causes of acute pancreatitis
Idiopathic Gallstones Ethanol Trauma Scorpion Mumps Autoimmune Steroids Hyperlipideamia ERCP Drugs such as thiazides
presentation of acute pancreatitis
epigastric pain radiating to back that is relieved by sitting forward vomiting
how to diagnose acute pancreatitis
serum lipase-BEST (or serum amylase)
histology of acute pancreatitis
coagulative necrosis
what is often seen in alcohol pancreatitis
psuedocyst
causes of chronic pancreatitis
alcohol hyperlipidaemia autoimmune CF pancreatic duct obstruction
autoimmune cause of chronic pancreatitis
IgG4 sclerosing
presentation of chronic pancreatitis
malabsorption weight loss epigastric pain radiating to back steatorrhea
histology of chronic pancreatisi
fibrosis loss of endocrine tissue duct dilatation with thick secretions calcification
histology of acinar cell carcinoma
neoplastic epithilal cells with eosinophilic granular cytoplasm
immunoreactive markers i nacinar cell carcinoma
positive for lipase, trypsin and chemotrypsin
symptoms of acinar cell carcinoma
abdo pain wt loss nausea and diarrhoea mulifocal fat necrosis and polyarthralgia
what causes the multifocal fat necrosis and polyarthralgia in acinar cell carcinoma
lipase
where do pancreatic carcinoma usually occur
head of the pancreas
risk factors for pancreatic carcinoma
smoking, FAP, HNPCC, diet
what is trousseau’s syndrome
recurrent superficial thrombophlebitis
signs of pancreatic carcinoma
courvoisier’s sign palpable virchow’s node
symptoms of pancreatic carcinoma
ascites jaundice anorexia and cachexia upper abdo and back pain steatorrhea DM
location of neuroendocrine tumours
body and tail of pancreas
what genotype tend to get islet cell tumours
MEN1
what is zollinger ellison syndrome
gastric acid secreting islet cell tumour
signs of glucogonoma
necrolytic migrating erythema
signs of insulinoma
recurrent hypoglycaemia
MEN1 tumours
parathyroid hyperplasia/ adenoma pancreatic endocrine tumour pituitary adenoma
MEN2a tumours
parathyroid phaeo medullary thyroid
MEN2b
neurofibromatosis thyroid phaeo marfanoid phenotype
pancreatic malformations
ectopic pancreas pancreas divisum annular pancreas
what is ectopic pancreas
pancreas usually in stomach or SI
what is pacreas divisum
failure of fusion of dorsal and ventral buds of pancreas
what is the complication of pancreas divisum
pancreatitis
how does annular pancreas present
duedenal obstruction
what makes up a portal tract
hepatic vein, hepatic artery and bile duct
what is a hepatic lobule
hexagon that contains a centrilobular vein and has edges made up of portal tracts
what is a centrilobular vein
terminal branch of hepatic vein
what zone is the centrilobular vein in
3
what zone are the periportal hepatocytes in
1
what happens in zone 1 of the hepatic lobule
periportal hepatocytes receive blood rich in nutrients and O2
6 functions of liver
metabolism protein synthesis storage hormones metabolism bile synthesis immune function
metabolic functions of liver
drug metabolism glcyogen and glucose synthesis fatty acid metabolism
what proteins does the liver synthesise
all except gamma globulin e.g. fibrinogen, albumin and coagulation factors
what are the storage functions of the liver
glycogen vit A vit D vit B12 small amounts of vit K, iron, folate and copper
hormonal metabolism in the liver
activates vit D conjugates and excretes steroid hormones peptide hormone metabolism
what is the immunological funciton of the liver
antigens from gut go to the liver via portal circulation and are phagocytosed by kuppfer cells
what are risk factors for hepatic adenoma
OCP use
how does hepatic adenoma present
usually asymptomatic until rupture then present with pain and intraperitoneal bleeding
what is a hepatic haemangioma
common beign lesion venous malformation
causes of hepatocellular carcinoma
hep B,C NAFLD haemochromotosis alcoholic cirrhosisaflatoxin androgenic steroids
how to investigate hapatocellular carcinoma
alpha fetoprotein USS
4 types of malignant liver disease
hepatocellular carcinoma angiosarcoma cholangiocarcinoma hepatoblastoma
what is a cholangiocarcinoma
adenocarcinoma arising from bile duct
what causes cholangiocarcinoma
PSC Lynch syndrome type 2 chronic liver disease parasitic liver disease
what primary tumours normally cause liver mets
GIT, breast or bronchus
pathology of cirrhosis
hepatocyte necrosis fibrosis nodules of regenerating hepatocytes disruption of liver architecture and increased resistance to blood flow through the portal tract
genetic causes of liver cirrhosis
wilson’s haemochormotosis alpha 1 antitrypsin galactosaemia glycogen storage disease
viral causes of liver cirrhosis
hep B Hep C
biliary causes of liver cirrhosis
PBC PSC
drug that causes liver cirrosis
methotrexate
how is liver cirrhosis classified
macronodular or micronodular (<3mm is micronodular)
causes of micronodular cirrhosis
alcoholic liver disease biliary tract disease
causes of macronodular liver cirrhosis
wilson’s disease alpha one antitrypsin viral hepatitis
which normally quiecent cells are activated in chronic inflammation in liver cirrrhosis and what do they become
stellate cells become myofibroblasts
what do myelofibroblasts do in cirrhosis
deposit collagen in the space of Disse which initiates fibrosis
how is vascular resistance increased in liver cirrhosis
myofibroblasts contract sinusoids
how is prognosis in liver cirrhosis measured
modified Child’s Pugh score
what are the sections of a child’s pugh score
ascites encephalopathy albumin bilirubin PT time
when is child’s pugh score bad
>7 where 5 year survival is 45%
what are prehepatic causes of portal hypertension
portal vein thrombosis
what are hepatic causes of portal hypertension
pre sinusoidal: schistosomiasis, PBC, Sarcoid Sinusoidal: cirrhosis post sinusoidal: veno occlusive disease
post hepatic causes of portal hypertension
budd chiari syndrome
factors causing budd chiari syndrome
OCP leukaemia HCC/ renal tumour compressing idiopathic
how to treat budd chiari syndrome
TIPS procedure trans oesophageal intrahepatic portosystemic shunt
histological appearance of fatty liver
steatosis fat droplets in hepatocytes
is hepatic steatosis (fatty liver) reversible
yes
what is seen in alcoholic liver disease
hepatocyte balooning accumulation of fat, water and protein mallory bodies fibrosis
macroscopic signs of alcoholic heapatitis
large fibrotic liver
what is a mallory body (alcoholic liver disease)
cytoplasmic inclusion from damaged IF in the hepatiocyte
what is seen in alcoholic cirrhosis
micronocular cirrhosis nocules and bands of fibrosis
macroscopic appearance of alcohlic cirrosis
yellow fatty large liver that transforms into brown shrunken liver
what are the two types of non alcoholic fatty liver disease
simple steatosis and non-alcoholic steatohepatitis
risk factor for non alcoholic fatty liver disease
obesity
HLA asssociation for autoimmune hepatitis
HLA DR3
type 1 autoimmune hepatitis antibodies
ANA anti-smooth muscle (antiSMA) anti- soluble liver antigen anti actin Ig
type 2 autoimmune hepatitis antibodies
anti liver, kidney and microsomal Ig ab anti- LKM
who tends to get autoimmune hepatitis
eith young or post menopausal women often have sjogrens, PBC, SLE, RA
how to treat autoimmune hepatitis
immunosupression and liver transplant (often recurs)
PBC autoantibody
anti mitochondrial
PBC histology
loss of medium sized intra hepatic bile ducts with granulomas
PBC symptoms
pruritis abdo pain statorrhea xanthalasma skin pigmentation vit D malabsorption
markers raised in PBC
ALP cholesterol IgM
treatment of PBC
ursodeoxycholic acid
risk factor for PSC
IBD (UC)
what is the pathology of PSC
inflammation and obliterative fibrosis of intrahepatic and extrahepatic bile ducts formation of multifocal strictures with dilation of preserved segments
what markers are raised in PSC
ALP pANCA
what is seen on USS of PSC
bile duct dilation
what is seen on ERCP of PSC
beading of bile ducts
difference in locatio of PBC and PSC
PBC is dilation of intrahepatic bile ducts PSC is inflammation and fibrosis of both intra and extra hepatic
what is the difference between PBC and PSC on USS
PBC has no bile duct dilatation PSC has bile duct dilatation
what is the difference between patietns who get PBC and PSC
PBC women (young or old) PSC middle aged men
haemochromotosis genetic mutation
autosomal recessive HFE mutation on 6p21.3
haemochromotosis genetic defect
increased gut absorption of iron leading to deposition in kidney, adrenal, liver, heart
symptoms of haemochromotosis
cardiomyopathy diabetes hepatomegaly psuedogout hypogonadism bronzed skin
investigation findings in haemochromotosis
raised Fe and ferritin reduced TIBC transferrin saturaion >45%
stain used for haemochromotosis what does it stain and where
prussian blue stains Fe deposits in liver
treatmetn of haemochromotosis
venesection desferrioxamine
mutation and inheritance of wilsons disease
autosomal recessive ATP7B on chr 13
pathology of wilsons disease
faulty ATPase pump on canalicular membrane leading to reduced biliary excretion of copper resulting in deposition in CNS, eyes and liver
symptoms of wilsons disease
liver: fulminant liver failure, acute hepatitis brain: psychosis, parkinsonism, dementia eyes: keyser fleicher rings
what are keyser fleicher rings
deposition of copper in desmecets membrane of iris
histological findings of wilsons disease
mallory bodies fibrosis
treatmetn of wilsons disease
lifelong penecilamine
stain used for wilsons disease
rhodamine
serum markers in wilsons disease
reduced serum copper reduced serum caeruloplasmin increased urinary copper
inheritance of alpha 1 antitrypsin deficiency
autosomal dominant
pathophysiology of alpha 1 antitrypsin
A1AT accumulation in hepatocytes intracytoplasmic inclusions hepatitis lack of A1AT in lungs causes emphysema
stain for alpha 1 antitrypsin deficiency
periodic acid schiff stain
serum markers for alpha 1 anti trypsin deficiency
reduced A1AT absent alpha globulin band on electrophoresis
symptoms of alpha 1 antitrypsin deficiency
neonatal jaundice emphysema and chronic liver disease in adulthood
organisms responsible for PID
chlamydia gonorrhea TB schistosomiasis
olivopontocerebellar features
blance and coordination difficulties