I came time to publish this fact.

 

This is a depressed type of adenoma in the colon.

 

Why was depressed?

 
 Such adenoma is very rare in the United States and Europe.

However, very often in Japan.
 

Why?
 

Please see the next photo.
 

（出典：長廻鉱. 内視鏡的大腸病学、医学書院）



Please attention to here.

 

How do you think ?