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Lesion of PANCREASR3 Peerawit Songsiri
Table of Contents
Embryology & Anatomy 1
2 Congenital anomalies
3 Pancreatitis
4 Cyst and pseudocyst
5 Functional pancreatic disorder
6 Neoplasm
Embryology & Anatomy
Embryology
• Originate during 4th week of gestation from 2 endodermal buds that arise from caudal part of foregut • Dorsal duct
• Base of pancreatic diverticulum -> minor duct (Santorini) and papilla, body and tail of pancreas
• Ventral duct• Biliary diverticulum -> major duct (Wirsung), head of pancreas
• Fuse at 6-7 wks of gestation, may complete until perinatal period • Ventral bud consist 2 lobules open into hepatic diverticulum close
to gallbladder -> “common bile duct”
Embryology
Anatomy
• Retroperitoneal organ
Right on L2, lies in c loop of duodenum
Body cover L1
Tail rise to T12
Under SMA
Anatomy
Anatomy
Anatomy
2 tissue type
1. Exocrine ( acinar cells, centro-acinar, and ducts)
2. Endocrine cells
Blood supply
Congenital anomalies
• Annular pancreas
• Pancreas divisum
• Ectopic pancreatic rest
• Congenital short pancreas
Aunnular pancreas
Annular pancreas
• Rare condition• Second part of duodenum is surrounded by ring of pancreatic
tissue continuous with the head of the pancreas• Can cause duodenal stenosis or obstructive symptoms in first
days of life• Cause
• Faulty rotation of ventral pancreatic bud
Annular pancreas
Epidemiology
• 1 in 20,000 birth• Male : female = 2 :1 • Possible hereditary link• Associate with intestinal malrotation, trisomy 21
Clinical
• Bilious vomiting• “double-bubble” sign
Management
• Bypass of the obstructing lesion • Duodenoduodenostomy• Gastrojejunostomy
• Resection or division of annular pancreas should not be performed due to the variable and complex ductal system
Pancreas divisum
Pancreas divisum
• 10% of population ( most common congenital anomaly)• Can be found up to 25% in chronic pancreatitis • Result from • Duct of Wirsung is small, duct of Santorini becomes major ductal
system• If the orifice of accessory papilla is stenotic -> pancreatitis
• Majority of exocrine secretion drain to minor duct
Incidence
• Higher in patients with unexplained recurrent pancreatitis • 7.4% of all children with pancreatitis• 19.2% of relapsing or chronic pancreatitis
Investigation
• Magnetic resonance cholangiopancreatography (MRCP)• Noninvasive and accurate method • Fail to visualized duct of Wirsung
after injection of major papilla• Dilatation, irregularity, stricture
Investigation
• Endoscopic retrograde cholangiopancreatography (ERCP)• Most definitive and reliable diagnostic method • Demonstrate that Santorini duct is dominant • Can induce pancreatitis
Treatment
• In symptomatic patient (pancreatitis)
• Goal• Establish adequate drainage of the Santorini duct
Treatment
• Treatment of choice• Sphincteroplasty of the minor papilla
• Endoscopic stenting +/-sphincterotomy
• Longitudinal pancreaticojejunostomy• Chronic pancreatitis with dilated duct
Treatment
Ectopic pancreatic rest
Ectopic pancreatic rest
• Frequently encountered along foregut derivatives e.g. stomach, duodenum, jejunum, colon
• Most common anomaly of gastric antrum • May be result of aberrant epithelial-mesenchymal interaction ->
trans differentiation of embryonic epithelium • Typically asymptomatic and encountered incidentally at
laparotomy or endoscopy • Usually not become inflamed, but can cause intestinal
obstruction or bleeding
Management
• Excision unless excision cause significant complication
Congenital short pancreas
Congenital short pancreas
• Unusual anomaly described in individuals with polyspleniasyndrome or isolated anomaly
• Pancreas appears blunted and lacks tissue in the region of body and tail (agenesis of dorsal pancreatic bud)
• Pancreatic function generally remains normal
Pancreatitis • Acute pancreatitis
• Chronic pancreatitis
Acute pancreatitis
Acute pancreatitis
• Acute inflammation of pancreas • Varying in severity • Acute recurrent pancreatitis
• Episode of inflammation completely resolve and then recur
• Incidence• 3.6-13.2 cases per 100,000 children
Histopathology
• Fulminant necrotizing pancreatitis • Diffuse stippled necrosis of pancreatic parenchyma and peripancreatic
fat
Cause
• Trauma• Fixed against lumbar spine
Cause
• Drug• Asparaginase• Didanosine• Azathioprine• Mercaptopurine • Valproic acid
• Biliary tract stone disease• Assoc with hemolytic disorder
e.g. spherocytosis, alpha-thalassemia, sickle cell disease
• Choledochal cyst• Duct compression • Bile reflux from long common
channel biliary-pancreatic duct • Assoc with malunion of
pancreatic and biliary ducts (pancreaticobiliary malunion)
Cause
• Systemic illness• CF• Reye syndrome• Hyperlipidemia• Hypercalcemia
• Infection• Kawasaki disease• Coxsackievirus, rota virus
• Liver transplant
• Ductal developmental anomalies• Pancreas divisum
• Metabolic derangements• Idiopathic ***
Pathophysiology
• Non physiologic calcium signaling in pancreas• Premature activation of acinar proenzymes (trypsin)
• Acinar cell injury + cytokine release
cytokine
Vascular dissemination
Free radical formation
Release of vasoactive substance
Extra pancreatic inflammation
Diagnosis
Criteria : 2/3 of the following • Acute abdominal pain (epigastric region)• serum amylase or lipase ≥ X3 of normal upper limit • Imaging
Diagnosis
• Physical examination• Diffuse tender with sign of peritonitis• Distension• Paucity of bowel sound • Grey Turner sign (Flank), Cullen sign(Umbilicus)
Severity
• Debanto et al 2002,• Respiratory failure : PaO2 < 60 mmHg• Renal failure : Cr > 2mg/dL, urine output < 0.3 ml/kg/h > 1 day• Pseudocyst development • Shock : need of vasopressor • Need operation • GI bleed• mortality
Pediatric acute pancreatitis severity (PAPS)
• At admission• Age < 7 years• Weight < 23 kg• WBC > 18,500• LDH > 2000
• At 48 hr after admission• Ca2+ < 8.3 mg/dK• Albumin < 2.6 g/dL• Fluid sequestration > 75
ml/kg/48 hr• Rise in BUN > 5 mg/dL
Investigation
• ↑ amylase, lipase• Lipase more sensitive in infant and toddler• Degree of elevation dose not correlate with severity
Hyperamylasemia
Salivary inflammation
Intestinal perforation/ischemia/necrosis
Hyperlipasemia
Pancreatic cancer
Macrolipasemia
Renal insufficiency
Hypertriglyceridemia
Imaging
• Plain abdominal film• Exclude intestinal perforation • Radiopaque gallstone• Gas-filled right colin • Isolated loop of intestine in the vicinity of
inflamed pancreas -> sentinel loop• Colon cut-off sign• Pancreatic calcification -> chronic
pancreatitis
• Chest film• Pleural effusion (left basal)• Pulmonary edema -> sign of systemic
cytokine releaseColon cut-off sign
Imaging
• Abdominal CT• Detect complication• Pancreatic necrosis• Pancreatic pseudocyst• Fluid collection
• Abdominal ultrasound • Evaluate biliary stone, choledochal cyst, pancreatic
pseudocyst(Hypoechoic or anechoic collection)
Imaging
Severe pancreatitis
Imaging
• MRCP• Evaluate pancreatic ductal anatomy in children with recurrent or
unexplained pancreatitis
Imaging
• ERCP• Rarely indicated for acute pancreatitis• Diagnosis or treatment of acute, recurrent, chronic pancreatitis • Avoid during acute phase• Can aggravate pancreatitis
Treatment
• Goal1. Minimize any causative factors2. Provide meticulous supportive care
Treatment
• Pain control : Fentanyl safer • Meperidine -> risk of seizure, euphoria, drug interaction • Morphine -> Sphincter of Oddi spasm
• IV resuscitation : Urine output > 2ml/kg/hr , retain Foley
• Pancreatic rest : • NPO, retain NG• Histamine-2(H2) receptor antagonist -> reduce exposure of duodenal
secretin-producing cells to gastric acid ( simulator of pancreatic secretion)
• Monitor complication• Beware of hypocalcemia, hypomagnesemia, anemia • Organ failure
Treatment
• Nutrition• Early nutrition within first 72 hrs• Preferred Enteral > total parenteral• No different of liquid or solid food as the initial meals
• ATB • No role of prophylactic• Imipenem is ATB of choice in necrotizing pancreatitis
• Somatostatin, glucagon, anticholinergics, histamine blockers, protease inhibitor • Recommended but not show conclusive benefit
Surgery
• Indication for exploration1. Infected necrotic pancreatitis 2. Pancreatic abscess
• PCD then minimal invasive necrosectomy
Complication
• Necrotizing pancreatitis
• Pseudocyst
• Ascites
• Pancreatic fistula
Ascites
• Uncontained leakage from major pancreatic ductal injury • CT, ERCP, MRCP should be performed if suspected• Mx
• Bowel rest• Nutrition• Long-acting of somatostatin analogs
• Can spontaneously resolve
Ascites
• Longer time can cause pseudocyst formation• In ductal injuries -> operation may needed
• Depend on nature and site of injury
Site of injury Mx of choice
Distal duct injury Pancreatic resection
Proximal injury Roux-en-Y jejunal onlayanastomosis
Pancreatic fistula
• Develop postoperative or from nonoperative management • Low output
• Spontaneous resolve • Long acting somatostatin accelerate closure
• Roux-en-Y jejunostomy anastomosed to the fistula in failed case
Chronic pancreatitis
Chronic pancreatitis
• Irreversibility of changes associated with the inflammation • Uncommon• 3-10 cases per 100,000• Recurrent episodes of upper abdominal pain assoc with varying
degrees of pancreatic exocrine and endocrine dysfunction
Pathogenesis
• Significant parenchymal and acinar destruction due to inappropriate activation of digestive enzymes + inflammation, fibrosis, loss of function
• Unknown pathogenesis• Repeat episodes of acute pancreatitis• Environmental trigger• Genetic susceptibilities• Factor lead to inflammatory response
Pathogenesis
Sentinel acute pancreatic event (SAPE)
activate
Normal pancreatic stellate cell
Myofibroblast-like cells
Clinical problems
1. Severe intractable pain (require narcotic)
2. Malabsorption require enzyme replacement for life
3. Life-threatening complication e.g. pancreatic pseudocyst, pancreatic ascites, biliary obstruction
4. 13-fold increased risk of pancreatic cancer
5. Development of insulinopenia and overt diabetes mellitus
Causes
• Hereditary• Trauma• Systemic disease• Malformation of pancreaticobiliary duct
• Pancreas divisum• Annular pancreas• Pancreaticobiliary malunion
Causes
Classification
Chronic calcifying pancreatitis
Hereditary• Cationic trypsinogen gene PRSS1, SPINK1, CFTR• Increased risk of pancreatic cancer after age 50
years
idiopathic
Assoc with intraductal pancreatic stones, pseudocyst, aggressive scar formation
Chronic obstructive pancreatitis
Anatomic or functional obstruction• Pancreas divisum• Choledochal cyst
Less scarring
Diagnosis
• Blood test : pancreatic enzyme• ↑ ≥ x3 of amylase/lipase• Stool test : pancreatic enzyme, fecal fat
• Pancreatic stimulation (secretin) test• Genetic testing in recurrent idiopathic pancreatitis with or
without family history • PRSS1 mutation, SPINK1, CFTR
Imaging
• Plain film• Calcification
• US• Dilation of pancreatic or biliary
duct• Calcification• Complication : pseudocyst,
abscess, calculi, ascites
Imaging
• CT• Delayed enhancement on arterial phase • Microcalcifications throughout parenchyma• Calcified stones in the duct • Dilated of main pancreatic duct +/- CBD (“double
duct sign”
• MRCP• Evaluate ductal anatomy• Causes of chronic pancreatitis
Calcified stone in dilated duct
Endoscopic Assessment
• ERCP• Gold standard in diagnosis of adult CP• 1-11% morbidity of post ERCP pancreatitis
• Endoscopic ultrasound (EUS)
Management
• Palliation of symptoms• Pain control and hydration• Pancreatic enzyme supplement in steatorrhea
• In severe pain• ERCP, MRCP help locate correctable problems such as large stone or
stricture with distal duct dilatation
Management
• Surgical option1. Sphincteroplasty2. Excision of localized pancreatitis3. Subtotal pancreatectomy 4. Pancreatic drainage
1. Longitudinal pancreaticojejunostomy (Puestow)2. Lateral pancreaticojejunostomy (modified Puestow procedure)3. End-to-end pancreaticojejunostomy (Duval)4. Frey procedure
5. Duodenum or pyrolus-preserveing whipple
Management
Management
To be continued…