Lecture 15: Pathology of Pancreas and Gallbladder Flashcards

1
Q

Congenital pancreatic abnormalities

A

Pancreas agenesis/hypoplasia (rare, associated with other malformations), pancreas divisum, annular pancreas, heterotopic/ectopic pancreas

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2
Q

Pancreas divisum: main following

A

Main pancreatic duct drains through smaller minor papilla

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3
Q

Annular pancreas: define, disease, association

A

Band-like ring of pancreatic tissue around duodenum; can lead to obstruction; trisomy 21

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4
Q

Heterotopic/ectopic pancreas: define, common/rare? Disease?

A

Pancreatic tissue in an abnormal location (stomach, duodenum); very common; can lead to pain and bleeding if the enzymes accumulate

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5
Q

Pathophysiology of pancreatitis and 3 main ways

A

Digestion of pancreatic tissue due to inappropriate release of pancreatic enzymes; 1. Obstruction of duct; 2. Acinar cell injury; 3. Defective intraceullar transport

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6
Q

Alcohol can lead to which of the three pancreatitis pathways?

A

ALL THREE

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7
Q

Classification of pancreatitis (note: one pancreas can have all three patterns)

A

Interstitial edema, acute necrotizing pancreatitis, acute hemorrhagic pancreatitis

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8
Q

True/False: Acute pancreatitis is reversible

A

True

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9
Q

How is chronic pancreatitis different from acute?

A

Ongoing inflammation due to rounds of acute –> release of cytokines like TGFbeta and PDGF (fibrogetic) –> fibrosis and loss of acinar cells

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10
Q

Chronic pancreatitis: three patterns

A
  1. Duct dilation with abnormal shapes and calcification; 2. Fibrosis; 3. Atrophy of ACINAR CELLS FIRST (and eventually islet cells)
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11
Q

How to detect chronic pancreatitis on CT scan

A

Calcification

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12
Q

Chronic pancreatitis: sx, prognosis, complications

A

Silent until insufficiency occurs: malabsorption and diabetes; 25 year mortality = 50%; pseudocyst and adenocarcinoma

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13
Q

Describe pancreatic pseudocyst. IF a pancreatic cyst has an epithelium, what do you think about?

A

Most common pancreatic cyst, can be quite large, often peripancreatic (in ST around pancreas), hemorrhagic debris lined by capsule (NOT epithelium); cancer

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14
Q

T/F: Pancreatic ductal adenocarcinoma is preceded by dysplasia

A

True: there is a series of early lesions called “PanINs”

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15
Q

Almost all pancreatic ductal adenocarcinoma have these two lesions; half have these two

A

KRAS and p16/CDKN2A; TP53 and SMAD4/DPC4

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16
Q

Pancreatic cancer and genes (top three genetic associations)

A
  1. Peutz-Jeghers = 130x; 2. Hereditary pancreatitis = 75x; 3. Family history (>3 relatives) = 20x
17
Q

Pancreatic cancer: gross

A

Firm, stellate, poorly defined, head of pancreas

18
Q

Pancreatic cancer: histological

A

Irregular, infiltrating, gland-like

19
Q

Pancreatic cancer: histological findings unique to pancreas (3)

A
  1. STRONG desmoplastic reaction; 2. Tends to spread outside pancreas EARLY; 3. Perineural invasion (explains pain presentation and spread)
20
Q

Trousseau sign

A

Migratory thrombophlebitis: painful nodules that appear and disappear, usually on legs due to tumor-produced prothrombotic factors

21
Q

What kind of jaundice and what sign might you get with pancreatic cancer?

A

Onset of acute, PAINLESS jaundice with dilated gallbaldder (Courvoisier sign)

22
Q

Virchow’s node

A

Nontender, firm, fixed left supraclavicular lymph node

23
Q

Pancreatic cancer: risk factors

A

Old age, smoking, chronic pancreatitis, hereditary factors

24
Q

5-year survival for pancreatic cancer. Why so low?

A

5-10%; typically non-resectable due to growth into SMA

25
Q

List pancreatic neuroendocrine tumors and the clinical syndrome they cause

A

Insulinoma, gastrinoma (ZE syndrome), glucagonoma, somatostatinoma, VIPoma (Verner-Morison/WDHA syndrome with watery diarrhea, hypokalemia, achlorhydria)

26
Q

Pancreatic neuroendocrine tumors tend to be…

A

Soft, well-differentiated, with SALT AND PEPPER CHROMATIN

27
Q

How to figure out what kind of neuroendocrine tumor you’re dealing with…However, most of these tumors are…?

A

Stain for antigen; non-functional

28
Q

Calculous cholecystitis means…

A

Accumulation of stones INSIDE gallbladder

29
Q

Histology of gallbladder disease. This can lead to? If the gallbladder wall is transmurally involved and you get exudate on serosal surface, you get…

A

Fibrin, blood, neutrophils –> bag of pus = EMPYEMA of gallbladder; gangrenous cholecystitis (if gas-producing = emphysematous)

30
Q

Chronic cholecystitis means you don’t have _________, but you still have stones

A

Obstruction (in fact, due to stones)

31
Q

Histological finding of chronic cholecystitis

A

Rokitansky-Anschoff sinuses (out pouching of epithelium to wall of gall bladder, like a diverticulum)

32
Q

Gross findings of chronic cholecystitis (3)

A

Fibrosis, porcelain gallbladder (calcification) or atrophy

33
Q

Long-term structural complications of chronic cholecystitis

A

Fistula (dx with barium enema); e.g. cholecysto-colonic

34
Q

What do you get if you have a gallbladder fistula into small bowel?

A

Gallstone ileus (irritation of small bowel due to stones)

35
Q

Adenocarcinoma of gallbladder characteristic

A
  1. Firm growth along wall (like linitus in stomach) or 2. Fungating growth in lumen of gall bladder
36
Q

Adenocarcinoma of gallbladder: who gets it, risk, prognosis

A

Females, associated with gall stones and also with fungal infections in some parts of the world; poor prognosis (5 year = 5% due to difficult resection and silent growth)