Modified Johnson classification of benign gastric ulcers

Gastric ulcer type	Anatomic location	Gastric acid secretion	Incidence
I	Less curvature at incisura angularis	Normal or hypoactive	58%
II	Simultaneous gastric and duodenal ulcer	Hyperactive	22%
III	Pyloric or prepyloric channel ulcer, distal to incisura angularis	Hyperactive	20%
IV	High along lesser curvature to within 1-2 cm of the gastroesophageal junction	Hypoactive	Rare

References:

Johnson HD. Gastric ulcer: Classification, blood group characteristics, secretion patterns and pathogenesis. Ann Surg 1965; 162:996.
Herrington JL Jr, Sawyers JL. Gastric ulcer. Curr Probl Surg 1987; 24:759.

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