Yoshimitsu Ohgiya1, Noritaka Seino2, Shingo Miyamoto3, Nobuyuki Takeyama4, Kumi Hatano5, Jiro Munechika5, Kumiko Ishizuka5, Masanori Hirose5, Nobuyuki Ohike6, Toshi Hashimoto4, Akihiko Sekizawa3, Takehiko Gokan5. 1. Department of Radiology, Showa University School of Medicine, 1-5-8 Hatanodai Shinagawa-ku, Tokyo, 142-8555, Japan. ohgiya@med.showa-u.ac.jp. 2. Department of Radiology, Showa University Koto Toyosu Hospital, 5-1-38 Toyosu Koto-ku, Tokyo, 135-8577, Japan. 3. Department of Obstetrics and Gynecology, Showa University School of Medicine, 1-5-8 Hatanodai Shinagawa-ku, Tokyo, 142-8555, Japan. 4. Department of Radiology, Showa University Fujigaoka Hospital, 1-30 Fujigaoka Aoba-ku, Yokohama-shi, Kanagawa-ken, 227-8501, Japan. 5. Department of Radiology, Showa University School of Medicine, 1-5-8 Hatanodai Shinagawa-ku, Tokyo, 142-8555, Japan. 6. Department of Diagnostic Pathology, Showa University Fujigaoka Hospital, 1-30 Fujigaoka Aoba-ku, Yokohama-shi, Kanagawa-ken, 227-8501, Japan.
Abstract
PURPOSE: To evaluate the usefulness of computed tomographic (CT) features for identifying acute torsion of uterine subserosal leiomyoma (USL). SUBJECTS AND METHODS: We analyzed contrast-enhanced CT examinations of 7 USLs with torsion and 44 USLs without torsion. Two radiologists evaluated the CT features, which consisted of poor contrast enhancement inside the USL, thin rim enhancement around the USL, calcification within the USL, a beak sign between the uterus and USL, fan-shaped poor contrast enhancement in the uterus area adjacent to the USL (dark fan sign), and ascites. We analyzed the frequencies of these CT features in the USLs with versus without torsion using Fisher's exact test. RESULTS: The respective frequencies of CT features in USLs with and without torsion were as follows: poor contrast enhancement, 86 and 5% (P = 0.001); thin rim enhancement, 71 and 9% (P = 0.001); calcification, 29 and 18% (P = 0.61); beak sign, 57 and 86% (P = 0.10); dark fan sign, 57 and 0% (P = 0.001); and ascites, 100 and 20% (P = 0.01). CONCLUSIONS: The CT features of poor contrast enhancement, thin rim enhancement, and dark fan sign are valuable for identifying acute torsion of USL.
PURPOSE: To evaluate the usefulness of computed tomographic (CT) features for identifying acute torsion of uterine subserosal leiomyoma (USL). SUBJECTS AND METHODS: We analyzed contrast-enhanced CT examinations of 7 USLs with torsion and 44 USLs without torsion. Two radiologists evaluated the CT features, which consisted of poor contrast enhancement inside the USL, thin rim enhancement around the USL, calcification within the USL, a beak sign between the uterus and USL, fan-shaped poor contrast enhancement in the uterus area adjacent to the USL (dark fan sign), and ascites. We analyzed the frequencies of these CT features in the USLs with versus without torsion using Fisher's exact test. RESULTS: The respective frequencies of CT features in USLs with and without torsion were as follows: poor contrast enhancement, 86 and 5% (P = 0.001); thin rim enhancement, 71 and 9% (P = 0.001); calcification, 29 and 18% (P = 0.61); beak sign, 57 and 86% (P = 0.10); dark fan sign, 57 and 0% (P = 0.001); and ascites, 100 and 20% (P = 0.01). CONCLUSIONS: The CT features of poor contrast enhancement, thin rim enhancement, and dark fan sign are valuable for identifying acute torsion of USL.
Entities:
Keywords:
Computed tomography; Dark fan sign; Diagnostic imaging; Torsion; Uterine leiomyoma
Authors: H Ueda; K Togashi; I Konishi; M L Kataoka; T Koyama; T Fujiwara; H Kobayashi; S Fujii; J Konishi Journal: Radiographics Date: 1999-10 Impact factor: 5.333
Authors: Richard Bonney; Jonathan W Revels; Sherry S Wang; Rick Lussier; Courtney B Dey; Douglas S Katz; Mariam Moshiri Journal: Abdom Radiol (NY) Date: 2021-01-02