Stomach

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A drawing of the stomach.

Stomach is an important organ for pathologists. It is often inflamed and may be a site that cancer arises from. Gastroenterologists often biopsy the organ. Surgeons take-out the organ. It connects the esophagus to the duodenum. An introduction to gastrointestinal pathology is in the gastrointestinal pathology article.

Normal stomach

Gross anatomy

  • Cardia - first part of the stomach; joins with esophagus.
  • Fundus - superior portion - not attached directly to the esophagus.
  • Body - contains parietal cells.
  • Pylorus - distal (think pyloric stenosis); it joins with the duodenum.

Image

  • Stomach anatomy (WC)

Microscopic

Foveolar cells versus intestinal goblet cells

  • Intestinal goblet cells - clear mucin.
  • Foveolar cells - eosinophilic contents.

Stomach versus intestine

A tabular comparison:[1]

Feature Intestine Stomach
Spacing Goblets cell - spaced Foveolar cells - beside one another
Morphology of epithelial cells columnar tall columnar (Champagne flute)
Vesicle at luminal surface touching/small opening wide open
PAS-D -ve (???) +ve[2]
Villin stain[3][4] +ve -ve
Images Tubular adenoma - goblet
cells on right of image (WC) 		Gastric biopsy (microscopy-uk.org.uk),
Stomach with cancer - PAS (WC), Stomach (WC)

Notes:

  • Intraepithelial lymphocytes in the gastric mucosa have a clear halo around 'em.[5]
  • Memory device: Foveolar cells have friends, i.e. they are close to other foveolar cells.

Gastric antrum versus gastric body

Cell Body Antrum Histology Image
Parietal cell abundant few or none parietal cells: intensely
eosinophilic cytoplasm
Parietal cells. (WC)
Chief cell present absent chief cells: basophilic cytoplasm,
IHC: +ve for pepsinogen I
Chief cells. (WC)
G cell absent present fried egg appearance (clear cytoplasm,
round nucleus); look at high power -
usu. middle 1/3 of gland,[6]
IHC: +ve for gastrin.
G cell hyperplasia. (WC)
Surface flat blunted villi antrum is somewhat
duodenum-like
Body - flat. (WC)
Gastric glands
/ mucosa 		thick thin not so useful for
discrimination 		body - thick, body & antrum

Notes:

  • G cells may superficially resemble intraepithelial lymphocytes.
    • G cell nucleus is usu. perfectly round and slightly larger (diameter of 12 micrometers?) than a lymphocyte nucleus (diameter ~ 9-10 micrometers?).

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Short version

Stomach, Biopsy:
- Antral-type gastric mucosa within normal limits.

Stomach, Biopsy:
- Body and antral-type gastric mucosa within normal limits.

Stomach, Biopsy:
- Antral-type gastric mucosa within normal limits.
- NEGATIVE for Helicobacter-like organisms.
Block letters
STOMACH, BIOPSY:
- BODY AND ANTRAL-TYPE GASTRIC MUCOSA WITHIN NORMAL LIMITS.

STOMACH, BIOPSY:
- BODY AND ANTRAL-TYPE GASTRIC MUCOSA WITHIN NORMAL LIMITS.
- NEGATIVE FOR HELICOBACTER-LIKE ORGANISMS.

STOMACH, BIOPSY:
- ANTRAL-TYPE GASTRIC MUCOSA WITHIN NORMAL LIMITS.
- NEGATIVE FOR HELICOBACTER-LIKE ORGANISMS.

Long version

STOMACH, BIOPSY:
- BODY/ANTRAL-TYPE GASTRIC MUCOSA.
- INFLAMMATION: ABSENT.
- ATROPHY: ABSENT.
- INTESTINAL METAPLASIA: ABSENT.
- HELICOBACTER-LIKE ORGANISMS: NOT IDENTIFIED WITH ROUTINE STAINS.
- NEGATIVE FOR DYSPLASIA AND NEGATIVE FOR MALIGNANCY.

Sleeve gastrectomy

Main article: Sleeve gastrectomy

Introduction

Useful stains for stomach

Things to look for...

  • Parietal cells (indicate you're in the body of the stomach) - pink (eosinophilic) cytoplasm.
    • Lack of parietal cells -- DDx: Bx of antrum (pylorus), Bx of cardia, pernicious anemia.
  • Goblet cells = intestinal metaplasia.
  • Architectural distortion of gastric glands - suspect cancer.
  • Signet ring cells = (usually) gastric carcinoma.
    • Can be very easy to miss in some biopsies.
  • Inflammation + small bacteria = suspect H. pylori gastritis.

Some patterns

Gastric atrophy

General

  • Has a wide differential diagnosis.

Microscopic

Can take three general forms:

  1. Intestinal metaplasia - see intestinal metaplasia section.
  2. Pseudopyloric metaplasia; gastric body looks like gastric antrum.
    • Characterized by foveolar hyperplasia.
  3. Cell loss without replacement.
    • Clue is deep inflammation in the body.

Plasma cells in the stomach

DDx of plasmacytosis:

Granulomatous gastritis

  • Usual DDx of granulomatous disease (see Basics article):
    • DNF AAII:
      • Drugs, Neoplasms, Foreign body, Autoimmune, Allergic, Infectious, Idiopathic.

Important ones:

Non-neoplastic disease

Peptic ulcer disease

  • Abbreviated PUD.
For duodenal manifestations see Peptic duodenitis.

General

  • Benign.

Complications:

  • Hemorrhage.
  • Obstruction.
  • Perforation - can be fatal.

Etiology - typically:[11]

Gross

Features:

  • Typically in the duodenum; duodenum:stomach = ~4:1.
    • Epithelial defect with punched-out edges (suggestive of a benign process).

Note:

  • Heaped edges - suggestive of cancer.

Endoscopic image

  • Gastric ulcer. (WC)

Microscopic

Features:

Gastritis

Main article: Gastritis
Main article: Chronic gastritis
Main article: Acute gastritis

Helicobacter gastritis

Main article: Helicobacter gastritis

Intestinal metaplasia of the stomach

Main article: Intestinal metaplasia of the stomach

Inflammatory bowel disease and the stomach

See inflammatory bowel disease.
  • Histopathologic findings are usually non-specific.
  • Conventional thinking was upper GI involvement = Crohn's disease; this is changing.[12]

Endoscopic/gross

Features - Crohn's:[13]

  • +/-Linear fissures, erosions, ulcers, cobblestoning.
  • May mimic linitis plastica.

Microscopic

Features:[14]

  • Focal inflammation.
    • Common finding - non-specific.
  • +/-Granulomas.

Note:

  • Granulomas in Crohn's gastritis present 7-34% of the time.[13]

Images

  • CG - low mag. (WC)

  • CG - intermed. mag. (WC)

  • CG - high mag. (WC)

  • CG - very high mag. (WC)

Miscellaneous

This is a grab bag of stuff seen in the stomach. Some of it is quite rare.

Gastric antral vascular ectasia

Main article: Gastric antral vascular ectasia

Reactive gastropathy

Main article: Reactive gastropathy

Autoimmune metaplastic atrophic gastritis

  • AKA autoimmune gastritis.
Main article: Autoimmune metaplastic atrophic gastritis

Collagenous gastritis

Main article: Collagenous gastritis

Gastritis cystitis profunda

General

  • May be associated with glandular proliferation as well.[15] (???)
  • Super rare.
  • Similar to cystitis cystica.

Microscopic

Features:

  • Cystic spaces lined by foveolar epithelium.

Ménétrier's disease

Main article: Ménétrier's disease

Gastric xanthoma

  • Abbreviated GX.
  • AKA xanthelasma.
  • AKA stomach lipidosis.
Main article: Gastric xanthoma

Gastric ischemia

Gastric necrosis redirects here.

General

  • Rare.
  • May arise due to:
    • Small bowel obstruction.[16]
    • Therapeutic embolization.[17]

Microscopic

Features:

  • +/-Pseudomembrane formation.[18]
  • Necrosis of the epithelium lining the gastric pits.

Image:

Portal hypertensive gastropathy

  • Abbreviated PHG.
Main article: Portal hypertensive gastropathy

Amyloidosis of the stomach

  • AKA gastric amyloidosis.
Main article: Amyloidosis

General

Gross/endoscopy

  • Red/swollen gastric folds.[19]

Endoscopic DDx:

Microscopic

Features:

  • Lamina propria expanded by amorphous paucicellular material.

Image:

Stains

Eosinophilic gastritis

Main article: Eosinophilic gastritis

Proton pump inhibitor effect

  • Abbreviated PPI effect.
Main article: Proton pump inhibitor effect

Gastric polyps

Similar to colonic polyps - see intestinal polyps.

DDx polyp (similar to colon & rectum):

Inflammatory fibroid polyp

Main article: Inflammatory fibroid polyp

Hyperplastic polyp of the stomach

Main article: Hyperplastic polyp of the stomach

Fundic gland polyp

Main article: Fundic gland polyp

Neoplastic

The spectrum from benign to malignant is divided into five:[22]

  1. Benign.
  2. Indefinite for gastric epithelial dysplasia.
  3. Low-grade gastric epithelial dysplasia.
  4. High-grade gastric epithelial dysplasia.
  5. Gastric carcinoma.

Gastric dysplasia

Main article: Stomach adenoma

Gastric neuroendocrine tumour

  • AKA neuroendocrine tumour of the stomach and gastric NET.

General

  • Behaviour dependent on the subtype.
  • Uncommon.

Overview of subtypes

Divided into four types:[23]

Tumour type Relative prevalence Multifocality Tumour size Typical location Clinical Other Histology
Type 1 ~75% yes small (5-10 mm) body benign typically, female:male ~ 4:1, 50-60 years chronic atrophic gastritis - usu. autoimmune WDNET, WDNEC
Type 2 rare yes small ~15 mm body aggressive, ~50 years old assoc. MEN I, hyperchlorhydia WDNEC, WDNET
Type 3 10-15% no small and large variable location aggressive if >2.0 cm, males > females normal gastrin levels WDNET
Type 4 extremely rare no large variable location aggressive (mets usu. at time of Dx), males > females elevated gastrin d/t parietal cell dysfunction PDNEC

Notes:

  • WDNET = well-differentiated neuroendocrine tumour.
  • WDNEC = well-differentiated neuroendocrine carcinoma.
  • PDNEC = poorly-differentiated neuroendocrine carinoma.

Microscopic

See neuroendocrine tumours

Neoplastic rare

Gastric calcifying fibrous tumour

Main article: Calcifying fibrous tumour

Gastric cancer

Gastric lymphoma

Main article: MALT lymphoma

General

  • Associated with helicobacter infection.[24]
  • Usually MALT lymphoma (mucosa-associated lymphoid tissue lymphoma).

Microscopic

Features:

  • Sheets of lymphoid cells.
  • "Lymphoepithelial lesion" - gastric crypts invaded by a monomorphous population of lymphocytes.[25]
    • Features:
      1. Cluster of lymphocytes - three cells or more - key feature.
        • Single lymphocytes don't count.
      2. Clearing around the lymphocyte cluster.
    • Associated with MALT lymphoma;[26] however, not specific.

DDx:

IHC

  • Panker -- most useful.

Others:

  • CD3 (T cells) - scatter positivity.
  • CD20 (B cells) +ve.
  • CD138 (plasma cells).
  • kappa, lambda -- often one is predominant, suggesting clonality.
  • BCL2 +ve.

Treatment

  • Triple therapy (two antibiotics, proton pump inhibitor (PPI)).[29]
  • Surgery - if triple therapy fails.

Review paper: PMID 16950858.

Hereditary gastric cancer

Several syndromes are associated with gastric cancer:[30]

Disease Gene Histology Other
Hereditary diffuse gastric cancer (HDGC) syndrome CDH1 (E-cadherin)[31] diffuse - more specifically signet ring cell carcinoma most important; assoc. invasive lobular carcinoma[32]
Lynch syndrome MSH2, MLH1, others ? colorectal carcinoma, endometrial carcinoma
Familial adenomatous polyposis APC ? adenomatous polyps
Peutz-Jeghers syndrome STK11 ? stomach hamartomas - not precursor
Li-Fraumeni syndrome TP53 (p53) ? AKA SBLA syndrome = sarcomas, breast, brain, leukemia, laryngeal, lung, adrenocortical carcinoma
Familial breast and ovarian cancer 2[33] BRCA2 ? ?

Gastric carcinoma

Includes gastric adenocarcinoma.
Main article: Gastric carcinoma

See also

References

  1. ↑ ALS. 4 Feb 2009.
  2. ↑ Rubio, CA. (Jun 2007). "Gastric duodenal metaplasia in duodenal adenomas.". J Clin Pathol 60 (6): 661-3. doi:10.1136/jcp.2006.039388. PMC 1955048. PMID 16837629. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1955048/.
  3. ↑ Osborn M, Mazzoleni G, Santini D, Marrano D, Martinelli G, Weber K (1988). "Villin, intestinal brush border hydrolases and keratin polypeptides in intestinal metaplasia and gastric cancer; an immunohistologic study emphasizing the different degrees of intestinal and gastric differentiation in signet ring cell carcinomas". Virchows Arch A Pathol Anat Histopathol 413 (4): 303–12. PMID 2459839.
  4. ↑ Braunstein, EM.; Qiao, XT.; Madison, B.; Pinson, K.; Dunbar, L.; Gumucio, DL. (May 2002). "Villin: A marker for development of the epithelial pyloric border.". Dev Dyn 224 (1): 90-102. doi:10.1002/dvdy.10091. PMID 11984877.
  5. ↑ Sternberg H4P 2nd Ed., P.484
  6. ↑ URL: http://www.lab.anhb.uwa.edu.au/mb140/CorePages/GIT/git.htm. Accessed on: 3 December 2010.
  7. ↑ http://www.histology-world.com/stains/stains.htm
  8. ↑ Goggin N, Rowland M, Imrie C, Walsh D, Clyne M, Drumm B (December 1998). "Effect of Helicobacter pylori eradication on the natural history of duodenal ulcer disease". Arch. Dis. Child. 79 (6): 502-5. PMC 1717771. PMID 10210995. http://adc.bmj.com/cgi/pmidlookup?view=long&pmid=10210995.
  9. ↑ http://www.histology-world.com/stains/stains.htm
  10. ↑ http://www.histology-world.com/stains/stains.htm
  11. ↑ Malfertheiner, P.; Chan, FK.; McColl, KE. (Oct 2009). "Peptic ulcer disease.". Lancet 374 (9699): 1449-61. doi:10.1016/S0140-6736(09)60938-7. PMID 19683340.
  12. ↑ Lin J, McKenna BJ, Appelman HD (November 2010). "Morphologic findings in upper gastrointestinal biopsies of patients with ulcerative colitis: a controlled study". Am. J. Surg. Pathol. 34 (11): 1672–7. doi:10.1097/PAS.0b013e3181f3de93. PMID 20962621.
  13. ↑ 13.0 13.1 Iacobuzio-Donahue, Christine A.; Montgomery, Elizabeth A. (2005). Gastrointestinal and Liver Pathology: A Volume in the Foundations in Diagnostic Pathology Series (1st ed.). Churchill Livingstone. pp. 80. ISBN 978-0443066573.
  14. ↑ Kirsch R. 13 December 2010.
  15. ↑ URL: http://www.springerlink.com/content/u2v2525241754557/ Accessed on: 19 November 2010.
  16. ↑ Steen, S.; Lamont, J.; Petrey, L. (Jan 2008). "Acute gastric dilation and ischemia secondary to small bowel obstruction.". Proc (Bayl Univ Med Cent) 21 (1): 15-7. PMC 2190544. PMID 18209748. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2190544/.
  17. ↑ 17.0 17.1 Papanikolaou, IS.; Foukas, PG.; Sioulas, A.; Beintaris, I.; Panagopoulos, P.; Karamanolis, G.; Panayiotides, IG.; Dimitriadis, G. et al. (2011). "A case of gastric ischemic necrosis.". Endoscopy 43 Suppl 2 UCTN: E342. doi:10.1055/s-0030-1256795. PMID 22020717.
  18. ↑ Herman, J.; Chavalitdhamrong, D.; Jensen, DM.; Cortina, G.; Manuyakorn, A.; Jutabha, R. (Apr 2011). "The significance of gastric and duodenal histological ischemia reported on endoscopic biopsy.". Endoscopy 43 (4): 365-8. doi:10.1055/s-0030-1256040. PMID 21360426.
  19. ↑ 19.0 19.1 Kamata, T.; Suzuki, H.; Yoshinaga, S.; Nonaka, S.; Fukagawa, T.; Katai, H.; Taniguchi, H.; Kushima, R. et al. (2012). "Localized gastric amyloidosis differentiated histologically from scirrhous gastric cancer using endoscopic mucosal resection: a case report.". J Med Case Rep 6 (1): 231. doi:10.1186/1752-1947-6-231. PMC 3438062. PMID 22863214. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3438062/.
  20. ↑ Wu, D.; Lou, JY.; Chen, J.; Fei, L.; Liu, GJ.; Shi, XY.; Lin, HT. (Nov 2003). "A case report of localized gastric amyloidosis.". World J Gastroenterol 9 (11): 2632-4. PMID 14606114.
  21. ↑ Sawada, T.; Adachi, Y.; Akino, K.; Arimura, Y.; Ishida, T.; Ishii, Y.; Endo, T. (2012). "Endoscopic features of primary amyloidosis of the stomach.". Endoscopy 44 Suppl 2 UCTN: E275-6. doi:10.1055/s-0032-1309750. PMID 22814919.
  22. ↑ Rugge, M.; Correa, P.; Dixon, MF.; Hattori, T.; Leandro, G.; Lewin, K.; Riddell, RH.; Sipponen, P. et al. (Feb 2000). "Gastric dysplasia: the Padova international classification.". Am J Surg Pathol 24 (2): 167-76. PMID 10680883.
  23. ↑ URL: http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/StomachNET_11protocol.pdf. Accessed on: 29 March 2012.
  24. ↑ Mbulaiteye, SM.; Hisada, M.; El-Omar, EM. (2009). "Helicobacter Pylori associated global gastric cancer burden.". Front Biosci 14: 1490-504. PMID 19273142.
  25. ↑ Bailey, D. 6 August 2010.
  26. ↑ Papadaki, L.; Wotherspoon, AC.; Isaacson, PG. (Nov 1992). "The lymphoepithelial lesion of gastric low-grade B-cell lymphoma of mucosa-associated lymphoid tissue (MALT): an ultrastructural study.". Histopathology 21 (5): 415-21. PMID 1452124.
  27. ↑ Kim, K.; Kim, EJ.; Kim, MJ.; Song, HJ.; Lee, YS.; Jung, KW.; Yu, E. (Dec 2009). "Clinicopathological features of syphilitic gastritis in Korean patients.". Pathol Int 59 (12): 884-9. doi:10.1111/j.1440-1827.2009.02462.x. PMID 20021615.
  28. ↑ Long, BW.; Johnston, JH.; Wetzel, W.; Flowers, RH.; Haick, A. (Sep 1995). "Gastric syphilis: endoscopic and histological features mimicking lymphoma.". Am J Gastroenterol 90 (9): 1504-7. PMID 7661178.
  29. ↑ Zullo, A.; Hassan, C.; Andriani, A.; Cristofari, F.; De Francesco, V.; Ierardi, E.; Tomao, S.; Morini, S. et al. (Aug 2009). "Eradication therapy for Helicobacter pylori in patients with gastric MALT lymphoma: a pooled data analysis.". Am J Gastroenterol 104 (8): 1932-7; quiz 1938. doi:10.1038/ajg.2009.314. PMID 19532131.
  30. ↑ Sereno, M.; Aguayo, C.; Guillén Ponce, C.; Gómez-Raposo, C.; Zambrana, F.; Gómez-López, M.; Casado, E. (Sep 2011). "Gastric tumours in hereditary cancer syndromes: clinical features, molecular biology and strategies for prevention.". Clin Transl Oncol 13 (9): 599-610. PMID 21865131.
  31. ↑ Online 'Mendelian Inheritance in Man' (OMIM) 192090
  32. ↑ Guilford, P.; Hopkins, J.; Harraway, J.; McLeod, M.; McLeod, N.; Harawira, P.; Taite, H.; Scoular, R. et al. (Mar 1998). "E-cadherin germline mutations in familial gastric cancer.". Nature 392 (6674): 402-5. doi:10.1038/32918. PMID 9537325.
  33. ↑ Online 'Mendelian Inheritance in Man' (OMIM) 600185
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