Fig. 3

Histologic features of histiocytes aggregating (hematoxylin–eosin stain). The bar shows 100 µm. a Less than 30% of the lamina propria is occupied by histiocytes aggregating in the gastric mucosa (yellow arrows). a′ The enlarged view of the red square in a. b More than 80% of the lamina propria is occupied by histiocytes aggregating in the gastric mucosa. b′ The enlarged view of the blue square in b