Suspected invasive placenta: evaluation with magnetic resonance imaging

Area of Science:

• Obstetrics and Gynecology
• Radiology
• Medical Imaging

Background:

• Invasive placenta (IP) presents diagnostic challenges.
• Accurate diagnosis of IP is crucial for appropriate management and patient outcomes.

Purpose of the Study:

• To evaluate the diagnostic utility of magnetic resonance imaging (MRI) for invasive placenta (IP).
• To identify specific MRI features indicative of IP.

Main Methods:

• MRI scans of 32 women with suspected IP were independently reviewed by four readers.
• Interobserver agreement was assessed using kappa statistics.
• Univariate and multivariate analyses were performed to correlate MRI findings with confirmed IP, estimating sensitivity, specificity, and accuracy.

Main Results:

• Fifty percent (16/32) of women had confirmed IP.
• Thinning or focal defect of the uteroplacental interface was the most significant MRI finding differentiating normal from invasive placenta (P < 0.0001).
• MRI demonstrated 84% sensitivity and 80% specificity for diagnosing IP, with thinning or focal defect of the uteroplacental interface showing 88% accuracy.

Conclusions:

• MRI is a valuable tool for diagnosing invasive placenta, offering acceptable accuracy.
• Thinning or focal defect of the uteroplacental interface is the most discriminating independent predictor of IP.
• This finding aids in differentiating normal placental implantation from invasive placenta.