LGIB ddx
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perianal, anus
rectum
left colon
right colon
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systemic
UGIB
colon
ileum
hemorrhoid
anal fissure, fistula
neoplasm
neoplasm
proctitis
diverticulitis
angiodysplasia
colitis
diverticulitis
angiodysplasia
colitis
neoplasm
diverticulitis
angiodysplasia
colitis
neoplasm
neoplasm
Meckel's diverticulum
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esophagus
coagulopathy
stomach
duodenum
systemic