BACKGROUND AND PURPOSE:Ependymoblastoma is a malignant embryonal tumor that develops in early childhood and has a dismal prognosis. Categorized by the World Health Organization as a subgroup of CNS-primitive neuroectodermal tumor, ependymoblastoma is histologically defined by "ependymoblastic rosettes." Because it is so rare, little is known about specific MR imaging characteristics of ependymoblastoma. We systematically analyzed and discussed MR imaging features of ependymoblastoma in a series of 22 consecutive patients.
Anterior corpectomy and fusion by a PEEK-cage and plate-screw osteosynthesis resulted in clinical improvement in all patients. Bony fusion was achieved in all patients in the long run. PEEK cages are allegedly less rigid than other xenografts. Similar to those, however, their use bears the risk of early cage-dislocation and subsidence. A comparison of industrial xenografts and autologous bone implants is required to challenge the different fusion techniques.
Peripheral hybrid CE-MRA at 3.0 T is feasible and proved to be reliable at depiction of stenoses and occlusions of the whole pelvic and lower leg arterial system.
Purpose:To compare conspicuity of zones of ablation on nonenhanced, gadopentetate dimeglumine-(Gd-DTPA) and ferucarbotran-(SPIO)-enhanced magnetic resonance (MR) images.
Materials and Methods:In all, 33 radiofrequency ablations (RFA) were performed in 17 healthy porcine livers at 1.5T MR imaging 1 day and 2 and 4 weeks after RFA: T2-weighted (w) ultra turbo spin echo (UTSE), proton density (PD)-w UTSE, T1-w gradient echo (GRE) pre-and 5 minutes postcontrast administration, dynamic T1-w GRE during Gd-DTPA (Magnevist) or SPIO (Resovist) administration, T2-w UTSE, and PD-w UTSE sequences 10 minutes after SPIO administration. Regions of interest (ROIs) for contrast-to-noise ratio (CNR) and signal-to-noise ratio (SNR) were drawn in consensus by two radiologists.Results: PD-w SPIO-enhanced images (23.5 Ϯ 5.5) showed higher liver-to-lesion CNR than T1-w GRE Gd-DTPA-enhanced images (13.5 Ϯ 6.1) 1 day after RFA (P Յ 0.05). At all other timepoints, liver-to-lesion CNR of PD-w and T2-w SPIO-enhanced images did not differ significantly from T1-w GRE Gd-DTPA-enhanced images (P Ն 0.05). Nonenhanced T2-w images revealed lower liver-to-lesion CNR (7.0 Ϯ 7.5/6.5 Ϯ 5.9/6.8 Ϯ 5.0, 1 day/2 weeks/4 weeks, respectively) than T2-w SPIO-enhanced (17.4 Ϯ 4.8/15.3 Ϯ 4.5/14.2 Ϯ 5.7), PD-w SPIO-enhanced (23.5 Ϯ 5.5/16.9 Ϯ 3.6, 1 day/2 weeks), and T1-w Gd-DTPA-enhanced (15.3 Ϯ 3.6/12.7 Ϯ 3.5, 2/4 weeks) images (P Յ 0.05). Liver-tolesion CNR of SPIO-enhanced dynamic T1-w GRE images after 30, 80, 150, and 240 seconds did not change significantly over time (P Ն 0.05).
Conclusion:One day after RFA lesion conspicuity on PD-w ferucarbotran-enhanced images is better than on T1-w GRE Gd-DTPA-enhanced images. At all other timepoints, ferucarbotran is not superior to gadolinium. Ferucarbotran-and gadolinium-enhanced images improve lesion conspicuity compared with nonenhanced T2-w images at all timepoints.
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