Tags

Type your tag names separated by a space and hit enter

Intracranial epidermoid cysts: diffusion-weighted, FLAIR and conventional MR findings.
Eur J Radiol. 2005 May; 54(2):214-20.EJ

Abstract

PURPOSE

To compare diffusion-weighted echo-planar imaging (DW) with spin-echo (SE), and fluid-attenuated inversion recovery (FLAIR) sequences in the evaluation of epidermoid cysts (ECs), and to evaluate T2 shine-through effect.

MATERIALS AND METHODS

Fifteen patients were imaged prospectively in two different 1.5 T magnetic resonance (MR) units with standard head coils with SE, FLAIR and DW echo planar imaging sequences. The qualitative and quantitative assessments were performed by two radiologists in consensus. Apparent diffusion coefficient (ADC) values were obtained from all ECs. Exponential DW images are obtained in 11 cases to eliminate T2 shine-through effects. The results are analyzed with variance analysis (ANOVA) and Bonferroni t method.

RESULTS

FLAIR sequence was superior to T1- and T2-weighted sequences in showing ECs. In 13 cases, the borders of the lesions could be delineated from the surrounding structures with only DW imaging where ECs were markedly hyperintense. The ADC values of ECs are significantly lower than CSF (P < 0.001), and significantly higher than deep white matter (P < 0.01). On exponential DW images, ECs had similar intensity with brain parenchyma showing that the real cause of the hyperintensity of the lesions on trace images is the enhanced T2 effect of the tissue.

CONCLUSION

FLAIR sequence is superior to the conventional MR sequences in demonstrating the ECs and DW imaging is superior to other MR sequences in delineating the borders of the ECs. Exponential DW images had shown that the hyperintensity in the trace images are caused by increased T2 effect of the lesion rather than the decrease in ADC values.

Authors+Show Affiliations

Department of Radiology, Burtom Radioimaging Center, Ataturk cad, Feraizcizade sok., NO:1, Osmangazi, Bursa, Turkey. bahattinh@hotmail.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article

Language

eng

PubMed ID

15837401

Citation

Hakyemez, Bahattin, et al. "Intracranial Epidermoid Cysts: Diffusion-weighted, FLAIR and Conventional MR Findings." European Journal of Radiology, vol. 54, no. 2, 2005, pp. 214-20.
Hakyemez B, Aksoy U, Yildiz H, et al. Intracranial epidermoid cysts: diffusion-weighted, FLAIR and conventional MR findings. Eur J Radiol. 2005;54(2):214-20.
Hakyemez, B., Aksoy, U., Yildiz, H., & Ergin, N. (2005). Intracranial epidermoid cysts: diffusion-weighted, FLAIR and conventional MR findings. European Journal of Radiology, 54(2), 214-20.
Hakyemez B, et al. Intracranial Epidermoid Cysts: Diffusion-weighted, FLAIR and Conventional MR Findings. Eur J Radiol. 2005;54(2):214-20. PubMed PMID: 15837401.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Intracranial epidermoid cysts: diffusion-weighted, FLAIR and conventional MR findings. AU - Hakyemez,Bahattin, AU - Aksoy,Umit, AU - Yildiz,Harun, AU - Ergin,Necdet, PY - 2004/06/06/received PY - 2004/06/28/revised PY - 2004/06/30/accepted PY - 2005/4/20/pubmed PY - 2005/11/9/medline PY - 2005/4/20/entrez SP - 214 EP - 20 JF - European journal of radiology JO - Eur J Radiol VL - 54 IS - 2 N2 - PURPOSE: To compare diffusion-weighted echo-planar imaging (DW) with spin-echo (SE), and fluid-attenuated inversion recovery (FLAIR) sequences in the evaluation of epidermoid cysts (ECs), and to evaluate T2 shine-through effect. MATERIALS AND METHODS: Fifteen patients were imaged prospectively in two different 1.5 T magnetic resonance (MR) units with standard head coils with SE, FLAIR and DW echo planar imaging sequences. The qualitative and quantitative assessments were performed by two radiologists in consensus. Apparent diffusion coefficient (ADC) values were obtained from all ECs. Exponential DW images are obtained in 11 cases to eliminate T2 shine-through effects. The results are analyzed with variance analysis (ANOVA) and Bonferroni t method. RESULTS: FLAIR sequence was superior to T1- and T2-weighted sequences in showing ECs. In 13 cases, the borders of the lesions could be delineated from the surrounding structures with only DW imaging where ECs were markedly hyperintense. The ADC values of ECs are significantly lower than CSF (P < 0.001), and significantly higher than deep white matter (P < 0.01). On exponential DW images, ECs had similar intensity with brain parenchyma showing that the real cause of the hyperintensity of the lesions on trace images is the enhanced T2 effect of the tissue. CONCLUSION: FLAIR sequence is superior to the conventional MR sequences in demonstrating the ECs and DW imaging is superior to other MR sequences in delineating the borders of the ECs. Exponential DW images had shown that the hyperintensity in the trace images are caused by increased T2 effect of the lesion rather than the decrease in ADC values. SN - 0720-048X UR - https://www.unboundmedicine.com/medline/citation/15837401/Intracranial_epidermoid_cysts:_diffusion_weighted_FLAIR_and_conventional_MR_findings_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0720-048X(04)00246-3 DB - PRIME DP - Unbound Medicine ER -