High Signal Intensity of the Cochlear Modiolus on Unenhanced T1-Weighted Images in Classical Infratentorial Superficial Siderosis
| Autor: | Matsusue, Eiji, Inoue, Chie, Matsumoto, Kensuke, Tanino, Tomohiko, Nakamura, Kazuhiko, Fujii, Shinya |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Yonago Acta Medica. 2022, 65(4), 270-277. doi:10.33160/yam.2022.11.001 Yonago Acta Med |
| ISSN: | 1346-8049 |
| DOI: | 10.33160/yam.2022.11.001 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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