V:vascular
I:infection/inflammation/itragenic/immunity
C:congenital
T:traumatic
A:angiodysplasia
M:metabolic
N:neoplasm
ischemic bowel
SMA供應2/3 T colon,IMA供應後D colon
-->splenic flexure易發生缺血
Functional cyst rupture
ddx: ovarian torsion/etopic pregnancy
specificity, PPV 用來r/i
sensitivity, NPV 用來r/o
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