yam65(4)_270.pdf 2.35 MB
Matsusue, Eiji Department of Radiology, Tottori Prefectural Central Hospital KAKEN
Inoue, Chie Department of Radiology, Tottori Prefectural Central Hospital
Matsumoto, Kensuke Department of Radiology, Tottori Prefectural Central Hospital
Tanino, Tomohiko Department of Radiology, Tottori Prefectural Central Hospital Researchers DB
Nakamura, Kazuhiko Department of Radiology, Tottori Prefectural Central Hospital
Fujii, Shinya Division of Radiology, Department of Multidisciplinary Internal Medicine, School of Medicine, Tottori University Researchers DB KAKEN
magnetic resonance imaging
Background: Superficial siderosis (SS) results from chronic bleeding in the subarachnoid space. SS can be classified as infratentorial SS (i-SS) and supratentorial SS (s-SS). The cochlear modiolus (CM) normally shows low signal intensity (SI) on Tl-weighted images (T1WI). We noticed persistently high SI of the CM on unenhanced thin-sliced T1WI in patients with i-SS. The purpose of this study was to evaluate the correlation between SS and high SI of the CM on unenhanced T1WI. Methods: This retrospective study analyzed three cases with i-SS, eight cases with s-SS, and 23 normal controls (NC) evaluated on unenhanced thin-sliced T1WI with a three-dimensional spoiled gradient-recalled echo sequence. CM-T1SI scores of 0, 1, and 2 indicated low, iso, and high SI, respectively. In cases with scores of 2 evaluated several times, all scores were reviewed for each case. The CM-T1SI ratio was defined as the contrast ratio between the CM and the cerebellum. Differences between the three groups were statistically analyzed based on the CM-T1SI score and ratio. Receiver operative curve (ROC) analysis was used to determine the cut-off values for differentiating the i-SS group from the NC group based on the CM-T1SI ratio. Results: Two patients with i-SS had a score of 2 on all evaluations. The CM-T1SI score and ratio differed significantly between the i-SS and NC groups. The accuracy of the CM-T1SI ratio for discriminating i-SS from NC was 98.9% at a cutoff value of 0.628. Conclusion: High SI of the CM on unenhanced TIWI can be an additional characteristic finding of i-SS.
Tottori University Medical Press
Yonago Acta Medica
|Current Journal Title||
Yonago Acta Medica
(C) 2022 Tottori University Medical Press.
Yonago Acta Medica. 2022, 65(4), 270-277. doi10.33160/yam.2022.11.001
Faculty of Medicine/Graduate School of Medical Sciences/University Hospital