PT  - JOURNAL ARTICLE
AU  - Shimono, Taro
AU  - Akai, Fumiharu
AU  - Yamamoto, Akira
AU  - Kanagaki, Mitsunori
AU  - Fushimi, Yasutaka
AU  - Maeda, Masayuki
AU  - Miki, Yukio
TI  - Different Signal Intensities between Intra- and Extracranial Components in Jugular Foramen Meningioma: An Enigma
DP  - 2005 May 01
TA  - American Journal of Neuroradiology
PG  - 1122--1127
VI  - 26
IP  - 5
4099  - http://www.ajnr.org/content/26/5/1122.short
4100  - http://www.ajnr.org/content/26/5/1122.full
SO  - Am. J. Neuroradiol.2005 May 01; 26
AB  - BACKGROUND AND PURPOSE: The purpose of this study was to evaluate retrospectively differences in MR signal intensity and contrast enhancement between intra- and extracranial components of jugular foramen meningioma (JFM).METHODS: MR studies of eight patients who underwent surgery for histologically confirmed JFM were reviewed retrospectively. Signal intensity differences between intra- and extracranial components of all eight JFMs on axial T1-, T2-, and postcontrast T1-weighted images were evaluated visually. In six of the eight JFMs, quantitative signal intensity evaluations were also performed by using relative signal intensity ratios of the intra- and extracranial components of JFM to CNS tissue at the same level. Paired t tests were used to evaluate differences in relative signal intensity ratios in each JFM between intra- and extracranial components.RESULTS: Both visual and quantitative signal intensity evaluations revealed that signal intensities of the intracranial component of JFM were significantly higher than those of the extracranial component on T1-, T2-, and postcontrast T1-weighted images. Results of relative signal intensity ratios were 0.89 ± 0.04 versus 0.77 ± 0.02 on T1-weighted images (P = .002); 1.66 ± 0.28 versus 0.88 ± 0.14 on T2-weighted images (P = .003); and 2.16 ± 0.29 versus 1.77 ± 0.26 on postcontrast T1-weighted images (P = .01).CONCLUSION: Intra- and extracranial components of JFM display different signal intensity and enhancement patterns. These differences may be related to histologic composition, and in particular, collagen content.