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[Detection and characterization with short TI inversion recovery MR imaging]
1Department of Radiology, Nippon Medical School Second Hospital, Kanagawa, Japan.
Abstract:
Short TI inversion recovery magnetic resonance imaging (STIR-MRI) with spin echo (SE) T1-and T2-weighted images of the pelvis was investigated to evaluate its usefulness in detecting and characterizing endometriosis. Thirty-one women suspected of having the disease were studied in detail. MR findings with and without STIR-MRI were correlated with the results of laparotomy (27 women) and laparoscopy (4 women). Surgery revealed endometriosis in 29 women (17 ovarian chocolate cysts, 22 intestinal adhesions, 14 cul-de-sac obliterations and 12 adenomyosis). The other two women did not have endometriosis (uterine prolapse in one and submucosal leiomyoma in one). An ovarian chocolate cyst was diagnosed when a T1-elongated lesion showed shading, loculus or a low intensity rim on SE MR images, and a low intensity rim on STIR-MRI. Only 12 of the 17 chocolate cysts and neither of the two hemorrhagic corpus lutein cysts were correctly diagnosed on SE MR images, whereas 18 of these 19 cysts were correctly diagnosed because of the low intensity rim on STIR-MRI. In the pathological analysis, the rim was found to be a fibrous capsule and there were many macrophages which phagocytized hemosiderin. For the assessment of ovarian chocolate cysts, accuracy improved from 63.2% to 94.7%. As for the adhesion between the intestine and the uterus, specificity improved from 61.9% to 90.5% and accuracy improved from 67.7% to 93.5% when STIR-MRI was used. For the assessment of the cul-de-sac obliteration, accuracy improved from 67.7% to 83.8%, although chi 2 analysis showed no significance. The major factors for the improved accuracy with STIR-MRI are the decrease of the motion artifact owing to the suppression of the fat signal, decreased chemical shift artifact and accurate differentiation of fat from hemorrhagic component. Therefore, STIR-MRI is a useful and reliable procedure and should be used together with SE T1-, T2-weighted images for the assessment of endometriosis.
Insights
Short TI inversion recovery magnetic resonance imaging (STIR-MRI) significantly improves the detection and characterization of endometriosis, especially ovarian chocolate cysts and adhesions. This advanced MRI technique enhances diagnostic accuracy compared to standard spin echo imaging.
Area of Science:
- Radiology and Medical Imaging
- Gynecological Imaging
- Pelvic MRI Techniques
Context:
- Endometriosis diagnosis relies on imaging, but differentiating lesions can be challenging.
- Standard MRI sequences may have limitations in characterizing certain endometriotic implants.
- Pelvic MRI is crucial for non-invasive assessment of endometriosis.
Purpose:
- To evaluate the added value of Short TI inversion recovery magnetic resonance imaging (STIR-MRI) in detecting and characterizing endometriosis.
- To compare the diagnostic performance of STIR-MRI with conventional spin echo (SE) T1- and T2-weighted images.
- To assess the accuracy of STIR-MRI in identifying ovarian chocolate cysts, intestinal adhesions, and cul-de-sac obliterations.
Summary:
- STIR-MRI significantly improved the accuracy of diagnosing ovarian chocolate cysts from 63.2% to 94.7%.
- For intestinal adhesions, STIR-MRI enhanced specificity from 61.9% to 90.5% and accuracy from 67.7% to 93.5%.
- STIR-MRI reduces motion and chemical shift artifacts, improving differentiation of fat from hemorrhagic components.
Impact:
- STIR-MRI is a valuable and reliable tool for endometriosis assessment, enhancing diagnostic confidence.
- Incorporating STIR-MRI alongside SE T1- and T2-weighted images optimizes pelvic MRI for gynecological conditions.
- Improved imaging accuracy can lead to better patient management and treatment planning for endometriosis.