Knight et al used ultrasound and MRI studies to diagnosis placenta accreta or increta. The authors are from Indiana University.
Patient selection: pregnant woman (usually third trimester)
US Findings
Weighted Value
placenta previa
0.103
lacunae
0.087
hypervascularity
0.091
loss of retroplacental space
0.093
where:
• Naive weighted value 0.1.
MRI Findings
multiple vessels
0.123
fibrin bands
0.117
bladder bulge
0.099
focal uterine bulge
0.098
myometrial invasion
0.094
placental vessels
Number of US+MRI Findings
Probability of Invasive Placental Disease
0
9%
1
13%
2
19%
3
27%
4
37%
5
48%
6
59%
7
69%
8
77%
9
84%
10
89%
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Specialty: Obstetrics & Gynecology
