H. Pylori Gastritis

Epidemiology:

Common sites:

• antral and cardiac predominant pan-gastritis

Gross features:

Histologic features:

• must see inflammation
• usually active but not always
• superficial lymphocytes in the LP are a low-power clue
• “seagulls in flight”
• in autopsy or gastrectomy specimens, bacteria may aggregate into balls

Immunophenotype:

Marker:	Sensitivity:	Specificity:
Giemsa
Alcian blue
Ag stain	Excellent
immunostain	Excellent

Molecular features:

Other features:

References: