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Pathology of Chronic Gastritis:

Helicobacter pylori associated

(Type B) Gastritis. 

Dr Sampurna Roy MD  

 

 

GI Path Online- Home Page Gastric Pathology - Home Page

                                                                                                                      

 

 

Chronic gastritis is defined as  the presence of chronic mucosal inflammatory changes  leading eventually to mucosal atrophy and intestinal metaplasia.

The epithelial changes may become dysplastic and constitute a backround for the development of carcinoma.

30% of endoscopically normal biopsies may show chronic gastritis.

Classification:

Type A : Autoimmune gastritis- Associated with pernicious anaemia. Body of the stomach is usually affected.

Type B : Environmental gastritis- Result from dietary or intraluminal factors, specially Helicobacter pylori. Usually localized in the antrum. In severe cases, the inflammation spreads to the proximal part of the stomach.

Type C : Chemical gastritis- Associated with ingestion of non-steroidal  anti-inflammatory drugs or bile influx

What is Helicobacter Pylori?

Small curved  gram negative bacillus that colonizes the mucus layer of the stomach.

The organisms adheres to the foveolar epithelium and in the crevices between foveolar cells.

Corkscrew-like  movement and production of enzymes play an important role in the pathogenesis.

Bacterial adhesins identify cell surface proteins, glycoconjugates and helps in colonization.

H. pylori  move along  the lateral border of the foveolar cells and weaken the mucosal barrier.

The intracellular space is widened and there is invasion by neutrophil polymorphs.

Proteases produced by the H. pylori digest  gastric mucin and further damage the epithelium.

Helicobacter associated patterns of Gastritis include:

          

(i) Antral-predominant  gastritis (principal cause of peptic ulcer)

(ii) Multifocal atrophic gastritis involving corpus, fundus and antrum (may develop gastric ulcer and gastric carcinoma). Helicobacter pylori are  also associated with the  development of gastric lymphoma.

Cag A+ strains of Helicobacter pylori (more ulcerogenic) are protective against development of gastroesophageal reflux disease.

What is Helicobacter heilmannii? Images Link (Dr Yutaka Tsutsumi MD )

This bacteria has an elongated spiral appearance and are present only in small number of patients.

Helicobacter helmannii is a possible cause of gastric ulcer.
 

Morphological Features: 

                         

-In the initial active phase there are features of acute gastritis characterised by neutrophil polymorphs in mucous neck region. In severe infection there is pit abscess formation.

-Cellular swelling and vacuolization, mucin loss and desquamation of surface epithelium.

-Erosion and frank ulceration.

-Degenerative and regenerative changes present.

-Regenerative changes - There are hyperplastic neck cells and elongated, distorted and tubular structures. The cells display cytoplasmic basophilia, increased mitoses and hyperchromatic nuclei, however the enlarged nuclei  show smooth regular nuclear membrane. 

(Differential diagnosis: Dysplasia or ca-in situ).

-As the disease progresses there is superimposed chronic inflammation (Active chronic gastritis). Neutrophils, eosinophils, basophils, macrophages, monocytes, plasma cells infiltrate the mucosa.

-Mucosa appears normal in thickness or slightly expanded by mononuclear cells.

-In early stage, lymphocytes and plasma cells are present in the superficial mucosa mostly along lesser curvature. (Chronic superficial gastritis)

-The inflammation extends into the glandular compartment.

-Focal epithelial cell dropout is noted.

-There is lymphoid follicle formation with or without germinal centres. This is a marker for H. pylori infection.

-Gradually develops pangastritis.

-There is glandular atrophy (Chronic atrophic gastritis)  

-Intestinal metaplasia replaces the gastric glands. H. pylori is markedly decreased in the late stage as  intestinal metaplasia creates an unfavourable environment for H. pylori.

- Gastric atrophy is  the end stage of chronic gastritis and is characterized by thinning of gastric mucosa in the absence of inflammation. 
Parietal and chief cells are decreased in number in the body (autoimmune gastritis). Antrum shows loss of pyloric glands (type B gastritis).

[ 2 main causes of Atrophic gastritis -

i) Helicobacter pylori associated multifocal atrophic gastritis involving corpus and antrum.

ii) Autoimmune gastritis restricted to the corpus ]

Note:

Following treatment of H. pylori infection the features of chronic gastritis with lymphoid follicles may persist .
These features are gradually resolve  after few years.

Following long term therapy with proton pump inhibitors there may be pseudo hypertrophy of parietal cells. Tiny fundic glands cysts lined by parietal and chief cells may be noted.

Histological responses to Helicobacter pylori infection: gastritis, atrophy and preneoplasia. 

Metaplasia in Chronic Gastritis:

 



Pyloric metaplasia: Replacement of fundic type  glands by mucus secreting glands.

Intestinal metaplasia:  Begins at the antral corpus junction then spreads to the antrum and fundus.

(i) Small intestinal type  (ii) Large intestinal type.
 

May be:

I - Complete :  Mainly sialomucin  or
           

II - Incomplete :  Neutral mucin (IIA) or
                            Sulfomucin (IIB)

1- Initially there is epithelial type change. 

2- Followed by villiform architecture of the mucosa.

3- Enterocytes disappear and there is colonic metaplasia.

Colonic mucosa is more likely to be associated with dysplasia and carcinoma.

Pancreatic metaplasia: Associated with autoimmune gastritis.

 

Further reading:

Evaluation of endoscopic and histological findings in Helicobacter pylori-positive Japanese young adults.  

Increased rate of Helicobacter pylori infection detected by PCR in biopsies with chronic gastritis.

Genetic alterations in benign lesions: Chronic gastritis and gastric ulcer.

Effect of Helicobacter pylori Eradication on the Outcome of Reflux Esophagitis and Chronic Gastritis in the Elderly. A Randomized, Multicenter, Eight-Month Study.

Comparison of Helicobacter pylori infection and gastric mucosal histological features of gastric ulcer patients with chronic gastritis patients.  

Helicobacter pylori infection, glandular atrophy and intestinal metaplasia in superficial gastritis, gastric erosion, erosive gastritis, gastric ulcer and early gastric cancer.

Histological changes in the gastric mucosa after Helicobacter pylori eradication.

Effect of Helicobacter pylori eradication on histological lesions of gastric mucosa. An 18-month follow-up study.

Histopathology of Helicobacter pylori infections.

Interobserver variation in the histopathological scoring of Helicobacter pylori related gastritis.  

Review article: Gastric atrophy and atrophic gastritis--nebulous concepts in search of a definition.

Histological classification of gastritis and Helicobacter pylori infection: an agreement at last? The International Workshop on the Histopathology of Gastritis.

Classification and grading of gastritis. The updated Sydney system.

Recognizing atrophy: another step toward a classification of gastritis.

 

GI Path Online- Home Page Gastric Pathology - Home Page

 

 

Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)


 

 

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