Diffusion-weighted Imaging of Ovarian Torsion: Usefulness of Apparent Diffusion Coefficient (ADC) Values for the Detection of Hemorrhagic Infarction
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- KATO Hiroki
- Department of Radiology, Gifu University School of Medicine
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- KANEMATSU Masayuki
- Department of Radiology, Gifu University School of Medicine High-level Imaging Diagnosis Center, Gifu University Hospital
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- UCHIYAMA Mariko
- Department of Radiology, Gifu University School of Medicine
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- YANO Ryuichiro
- Department of Obstetrics and Gynecology, Gifu University School of Medicine
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- FURUI Tatsuro
- Department of Obstetrics and Gynecology, Gifu University School of Medicine
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- MORISHIGE Ken-ichirou
- Department of Obstetrics and Gynecology, Gifu University School of Medicine
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抄録
Purpose: We undertook this study to evaluate the need for diffusion-weighted (DW) magnetic resonance (MR) imaging in detecting hemorrhagic infarction following ovarian torsion.<br/>Methods: The study included 14 consecutive patients aged 12 to 74 years (average age, 36 years) with surgical confirmation of ovarian torsion who underwent 1.5-tesla MR imaging. Pathologically, hemorrhagic infarction was found in 7 patients. We retrospectively reviewed signal intensity on T1-, T2-, and diffusion-weighted images and apparent diffusion coefficients (ADCs) in swollen ovarian stroma.<br/>Results: Fallopian tube thickening was seen in all patients. In patients with ovarian cystic lesion, maximum cyst wall thickness was significantly higher in patients with hemorrhagic infarction (mean, 13.5 ± 4.1 mm) than those without (mean, 5.0 ± 1.0 mm) (P < .05). Signal intensity did not differ significantly on T1-weighted, T2-weighted, and DW images between patients with and without hemorrhagic infarction. ADCs were significantly lower in patients with hemorrhagic infarction (1.20 ± 0.50 [× 10−3 mm2/s]) than those without (2.04 ± 0.26 [× 10−3 mm2/s]) (P < .01). With an ADC threshold of 1.80 [× 10−3 mm2/s], sensitivity for hemorrhagic infarction was 0.88 (7 of 8), and specificity was 1.00 (6 of 6).<br/>Conclusion: ADC measurements were useful for detecting hemorrhagic infarction in patients with ovarian torsion.
収録刊行物
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- Magnetic Resonance in Medical Sciences
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Magnetic Resonance in Medical Sciences 13 (1), 39-44, 2014
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