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25 Cards in this Set

  • Front
  • Back
Classifications of Neoplasms
-Benign = Adenomatous polyps
-Malignant = Adenocarcinoma(90-95% of malig.)
.Intestinal type
.Diffuse type
-Benign = Leiomyoma
-Malignant = GI stromal tumors(2% of malig.), Lymphoma(4-5% of malig.)
Gastric Leiomyoma
Definition : benign smooth muscle tumor
Epidemiology : most common gastric tumor
Gross Pathology : well circumscribed
Histopathology : smooth muscle cells
Complications :
Gastric Polyps definition
Definition : focal protrusion of mucosa into lumen.
-2 types
Gastric Polyps types
Non-neoplastic = Hyperplastic
-Occur following injury(e.g. ulcers) and are composed of aggregates of inflammatory cells and regenerating mucosal cells.
- Common
Neoplastic = Adenomatous = Adenoma
-Benign proliferation of epithelium and stroma.
-Malignant potential, but is not the precursor for most gastric adenocarcinoma (unlike colon)
new malignancies Gross patterns
Infiltrating = diffuse = linitis plastica
linitis plastica (leather bottle stomach)-extensive and involves most of the stomach
Gastric Metastases
1.Lymph nodes
-local lymph nodes
-left supraclavicular nodes (Virchow node)

2.Local invasion
-pancreas, duodenum, peritoneal seeding

3.Distant sites (via hematogenous spread)
-lungs, liver, brain, ovary (Krukenberg tumor)
Gastric Adenocarcinoma Etiology
Host genetics:
-IL-1B genotype
-variety of dietary factors
Pre-existing disease :
-H. pylori infection
-Chronic atrophic gastritis
-Pernicious anemia
Gastric Adenocarcinoma Pathogenesis
pre-existing disease
->intestinal metaplasia
Gastric Adenocarcinoma Locations
-Antropyloris(50-60%) > cardia(25%) > body-fundus
-Lesser curvature (40%)
-Greater curvature (12%)
-Therefore lesser curvature of antropyloric region is a common site.
Gastric Adenocarcinoma Morphology
-Early = spread only in mucosa +/- submucosa
-Advanced = spread into muscularis propria +/- serosa
-depth = prognostic factor(even superficial can mets)
-Sx arise w/ deeper involvement
Gastric Adenocarcinoma Types
1. Intestinal Type
2. diffuse type
Gastric Adenocarcinoma Intestinal Types
-Chronic gastritis w/ intestinal metaplasia → dysplasia → adenocarcinoma
-Arises from metaplastic intestinal epithelium → intestinal gland +/- mucin

Growth : in expanding front
Gastric Adenocarcinoma Diffuse Types
-Arises from gastric mucous cells → poorly differentiated,
-dis-cohesive (don't form glands) mucous cells = 'signet ring cells'
- +/- desmoplasia

Growth : infiltrative spread of single cells, cell clusters or sheets
Gastric Adenocarcinoma Prognostic factors
Significant prognostic features:
-depth of invasion(histologic stage)
-extent of nodal and distant metastases(clinical stage)

Not as significant : type of adenocarcinoma(i.e. intestinal and diffuse)
Gastric Lymphoma Basics
Names: gastric lymphoma = MALT lymphoma = MALToma

Type : low grade B cell lymphoma
Gastric Lymphoma Pathogenesis
Helicobacter pylori infection
->chronic inflammation(expansion of MALT) including influx of B cells; the likely substrate for lymphoma development.
Gastric Lymphoma Natural history
-some regress with H. pylori eradication
-indolent growth(excellent 5 yr survival s/p surgical removal)
-may transform to high grade lymphoma, with poorer survival
Gastric Lymphoma Gross
any gross pattern
Gastric Lymphoma Histopathology
Small malignant lymphocytes infiltrate mucosa and destroy gastric glands (lymphoid-epitheliod lesion)
H Pylori Prevalence/associations
Prevalence:50-60% worldwide
-Developing world = 70 - 80%
USA and developed world = 10 – 30%
-Gastritis(acute and chronic) 80 - 90%
-Peptic ulcer disease 10 – 15%
-Gastric adenocarcinoma 1%
-Gastric MALToma 0.01%
H Pyloori, Dx / Tx
Diagnostic methods:
-Non-invasive: serology, stool, breath test
-Invasive or biopsy based: urease, histology

Treatment Regimen: PPI with 2 antibiotics for 10-14 days
recommended: PAC, PMC, PBMT
H. Pylori Transmition
-Vomit has highest bug load
Gastric Cancer Epidemiology
-Second leading cause of cancer mortality
-Significant geographic variability(Asia=40-80, Latin America=10-50, USA=5-10
-Male-female ratio, 2:1
-Decreasing incidence globally
Gastric Cancer Clinical presentation

Gastric Cancer Diagnosis/prognosis
-Endoscopy as procedure of choice
-Staging: CT, EUS, Surgery
-Prognosis:TMN staging system