懂醫學英文的人救命~”thumb printing”是什麼?

如題~
我把整段打出來~可以幫我看一下thumb printing到底是指什麼ㄇ??
A small bowel series was performed on the fifth day of his admission and showed the changes characteristic os ASOE, namely, segmental narrowing of the intetine with proximal dilated loops and bowel wall thickening with \"thumb printing\".
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