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Struma ovarii: appearance on MR images
I Joja1, T Asakawa, A Mitsumori
1Department of Radiology, Okayama University Medical School, Okayama-City, Japan.
Abdominal Imaging
|January 28, 1999
Summary
Magnetic resonance (MR) imaging reveals characteristic findings for struma ovarii, a rare ovarian tumor. These MR imaging features include multicystic masses with solid components and specific signal intensities indicating gelatinous material.
Area of Science:
- Radiology
- Oncology
- Gynecologic Pathology
Background:
- Struma ovarii is a rare germ cell tumor of the ovary, often presenting diagnostic challenges.
- Accurate imaging is crucial for diagnosis and management of ovarian neoplasms.
Purpose of the Study:
- To investigate the characteristic appearance of struma ovarii on magnetic resonance (MR) images.
- To correlate MR imaging findings with histological diagnoses.
Main Methods:
- Retrospective review of MR images from 12 patients with histologically confirmed struma ovarii.
- Analysis included T1-weighted, T2-weighted, and contrast-enhanced T1-weighted sequences.
- Evaluation of tumor morphology, signal intensities, and enhancement patterns.
Main Results:
- All cases exhibited multicystic components with solid areas and thickened septa.
- T1-weighted images showed variable signal intensities (low to high), while T2-weighted images were predominantly high.
- Contrast enhancement was moderate to marked; viscid gelatinous material appeared as low signal on T1 and T2.
Conclusions:
- Multicystic appearance with solid components, lobulated surface, and specific signal intensities suggest struma ovarii.
- Characteristic MR imaging findings aid in differentiating struma ovarii from other ovarian masses.