ABSTRACT
Objective To observe the value of CE-MRA in differentiating secondary vascular tortuosity of the spinal cord caused by spinal vascular malformations (SCVM) or non-vascular malformations.Methods A retrospective analysis was performed on 30 patients suspected as SCVM.Based on the results of DSA or surgery,the patients were divided into SCVM group (n=16) or non-vascular malformation group (n=14).CE-MRA features were compared between the two groups,including the number,length,position,tortuosity degree of spinal cord tortuous vascular and whether the abnormal feeding artery existed surrounding tortuous vascular.Results Compared with non-vascular malformation group,SCVM group showed more average number of tortuous vascular [(1.38 ± 0.16) vs 1,P=0.012],longer tortuous vascular lengthy [similar lengthy of (9.68 ± 1.18) vertebral body vs(4.14±0.62) vertebral body,P＜0.001),higher score of tortuosity degree [(2.23 ± 0.22) scores vs (0.86±0.10) scores,P＜0.001] and more easier to appear abnormal feeding artery surrounding tortuous vascular [75.00％(12/16) vs28.57％(4/14),P=0.014].Furthermore,only2 cases (2/16,12.50％) of tortuous vascular located in and limited to lower thoracic vertebra (T7 T12 vertebrae) in SCVM group,while 11 cases (11/14,78.57％) in non-vascular malformation group (P=0.020).Conclusion Spinal cord secondary vascular tortuosity of SCVM can be well distinguished from that caused by non-vascular malformation with CE MRA spinal angiography.
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Objective To study MRI features of fibroma of tendon sheath(FTS)and giant cell tumor of tendon sheath(GCTTS), so as to improve the diagnosis and differential diagnosis of two lesions. Methods Seventeen patients with FTS and 27 patients with GCTTS confirmed by operation and pathology were retrospectively analyzed. All patients were examined with MRI. The location, size, shape and the relationship with the surrounding tissue, the signal feature and enhancing pattern of the two groups were compared. Imaging features in the two groups were assessed and analyzed by using independent samples t test and Chi-square test. Results FTS were nodular or mass-like lesions(n=11). Few lesions appeared adjacent bone absorption(n=2). On T2WI, the lesions showed peripheral low signal ring(n=6)or internal mixed low-signal intensity of was striped or filamentous configurations(n=10). The volume of low-signal intensity accounted for more than 2/3 of the total lesion's volume(n=6). Enhanced T1WI, tumors revealed ring enhancement(n=6). GCTTS appeared mostly lobulated(n=16), common with adjacent bone compressive absorption(n=9). On T2WI, most of lesion had a peripheral low signal ring(n=22). Tumors revealed mixed high signals intensity with granular or patchy irregular low signal intensity scattered in the mass(n=17), the area of low signal accounts for less than 1/3 of total neoplastic volume(n=18). On contrast T1WI, GCTTS appeared heterogenous enhancement. Statistical analysis showed that the shape of the lesion, the presence or absence of compressive bone absorption, the presence of a low signal ring around the lesion, the shape of the Low-signal in T2WI and the proportion, and the presence of circumferential enhancement(P0.05). Conclusion FTS and GCTTS has a different characteristic of MRI features. FTS were nodular or mass-like, T2WI signal was mixed low, the shape of the low-signal was striped or filamentous, accounting for more than 1/3 of total lesion's volume, enhanced T1WI, tumor shows ring enhancement;GCTTS appears mostly lobulated.Most of lesion has low signal ring, common with adjacent bone compress compressive absorption. T2WI, tumor reveals mixed high signals intensity with granular or patchy irregular low signal intensity scattered in the mass. The area of low signal accounts for less than 1/3 of total neoplastic volume.
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Objective To investigate the feasibility of hydrogen proton magnetic resonance spectroscopy (1 H-MRS)for detection of Wallerian degeneration of the pyramidal tract after cerebral infarction.Methods Multiple metabolic indices including NAA,Cho, Cr of the bilateral cerebral peduncle were detected by using 1 H-MRS in 1 5 patients with unilateral middle cerebral artery infarction and 1 5 age-matched healthy volunteers,NAA/Cr,Cho/Cr were also calculated.Comparing the difference between cerebral infarction group and the control group ,the ROC curve was analyzed.Results The values of NAA/Cr in the ipsilateral cerebral peduncle of cerebral infarction patients were significantly lower than that of the contralateral,and there were significant differences between the two groups(P 0.05),the Cho/Cr values of the ipsilateral and the contralateral cerebral peduncle had no significant difference compared with the control group (P >0.05).Conclusion 1 H-MRS can detect Wallerian degeneration of the pyramidal tract after cerebral infarction.
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Objective To evaluate the value of susceptibility-weighted imaging (SWI)sequence in the diagnosis of metastatic en-cephaloma pre and after radiotherapy by comparing the appearance of the SWI and contrast-enhanced T1-weighted imaging(T1 WI). Methods Thirty-eight lung cancer patients with brain metastases underwent SWI and contrast-enhanced T1-weighted imaging re-spectively before and 2-3 months after radiotherapy.Evaluated the two methods by score(the score ranged from 0-3,0 represen-ted no showing,1 represented not showing clearly,2 represented could judging,3 represented showing obviously).Results Before radiotherapy,SWI detected 1 61 lesions of metastases and could obviously show tumor vascular in brain metastases (mean score 2.73±0.05).Contrast-enhanced T1 WI detected 1 61 lesions(mean score 1.93±0.04 ).SWI showed significantly higher score than enhanced T1 WI(P <0.05)through paired sample t test.After radiotherapy,SWI found 98 lesions (mean score 1.47±0.1 1 )and en-hanced T1 WI found 140 lesions (mean score 1.80±0.07),enhanced T1 WI had significantly higher score than SWI(P <0.05).Con-clusion SWI is superior to contrast-enhanced T1 WI to show the metastases before radiotherapy and can show tumor vascular in brain metastases obviously.SWI is inferior to enhanced T1 WI after radiotherapy.It has some value and may provide a new method for evaluating effects of radiotherapy.