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Updated: Feb 15, 2026
Quantifying Mixing using Magnetic Resonance Imaging
Published on: January 25, 2012
To evaluate the feasibility of magnetic resonance imaging in predicting unusual site ectopic pregnancy: a
Gabriele Masselli1, Martina Derme2, Maria Grazia Piccioni2
1Radiology Dea Department, Umberto I Hospital, Sapienza University of Rome, Viale del Policlinico 155-00161, Rome, Italy. gabrielemasselli@libero.it.
Objective:
To evaluate the accuracy of pelvic MRI in the diagnosis of unusual ectopic pregnancy (EP), when ultrasound (US) examination is inconclusive.
Methods:
We retrospectively reviewed the medical records of 150 patients with suspected EP. Clinical, US and MRI features of 15 unusual EPs were analysed. Two radiologists independently reviewed each case resolving by consensus any diagnostic discrepancy. Interobserver agreement was assessed using the Cohen κ test.
Results:
MRI displayed a gestational sac-like structure surrounded by a thick wall in all cases. The thick wall displayed hyperintensity in 41 %, isointensity in 35 % and hypointensity in 24 % of cases on T1-weighted images. Diffusion- and fat saturation T1-weighted images were the most accurate sequences, as they enabled identification of 15/15 and 14/15 patients, respectively. Although US was false negative in detecting cervical and uterine infiltration underlying the caesarean scar, MRI was able to identify the invasion. Interobserver agreement was very good for all sequences (κ=0.892-1.0).
Conclusions:
MRI plays an important role in the early diagnosis of unusual EP. It should be considered after negative US findings, providing accurate evaluation of the site and the possible infiltration of these lesions, which help in the management of these patients.
Key Points:
• MRI is being increasingly used as a problem-solving modality in ectopic pregnancy. • MRI plays an important role in early diagnosis of unusual ectopic pregnancy. • Knowledge of MRI features in EP is essential to determinate appropriate management.
Insights
Pelvic MRI accurately diagnoses unusual ectopic pregnancies (EP) when ultrasound is inconclusive. MRI helps evaluate lesion site and infiltration, aiding patient management.
Area of Science:
- Radiology
- Diagnostic Imaging
- Women's Health
Background:
- Ectopic pregnancy (EP) diagnosis can be challenging with ultrasound (US).
- Unusual EP presentations require advanced imaging for accurate diagnosis and management.
Purpose of the Study:
- To evaluate the diagnostic accuracy of pelvic Magnetic Resonance Imaging (MRI) for unusual ectopic pregnancy (EP).
- To determine MRI's role when ultrasound (US) findings are inconclusive.
Main Methods:
- Retrospective review of 150 patients with suspected EP.
- Analysis of clinical, US, and MRI features in 15 unusual EP cases.
- Independent review by two radiologists with consensus resolution and interobserver agreement assessment (Cohen κ test).
Main Results:
- MRI identified a gestational sac-like structure in all cases.
- Diffusion- and fat-saturated T1-weighted MRI sequences showed high accuracy (15/15 and 14/15 patients).
- MRI detected cervical and uterine infiltration missed by US, with very good interobserver agreement (κ=0.892-1.0).
Conclusions:
- Pelvic MRI is crucial for the early diagnosis of unusual ectopic pregnancy.
- MRI provides accurate evaluation of lesion site and infiltration, guiding patient management.
- Consider MRI after inconclusive US findings for suspected unusual EP.
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