scholarly journals Significance of Pontine High Signal Intensity Lesions on Magnetic Resonance Imaging in Patients with Cerebral Infarction.

1998 ◽  
Vol 35 (3) ◽  
pp. 208-213 ◽  
Author(s):  
Hiroyuki Kamei ◽  
Hirofumi Abe ◽  
Aritsune Shibue ◽  
Katsuya Nishimaru ◽  
Takao Iwasaki
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Cerebral Infarction ◽  
Signal Intensity ◽  
High Signal Intensity ◽  
High Signal ◽  
Resonance Imaging

EXTENSIVE WHITE MATTER CHANGES AFTER STEREOTACTIC RADIOSURGERY FOR BRAIN ARTERIOVENOUS MALFORMATIONS

Neurosurgery ◽  
2008 ◽  
Vol 63 (6) ◽  
pp. 1064-1070 ◽  
Author(s):  
René van den Berg ◽  
Dennis R. Buis ◽  
Frank J. Lagerwaard ◽  
Geert J. Lycklama à Nijeholt ◽  
W. Peter Vandertop
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Arteriovenous Malformations ◽  
High Signal Intensity ◽  
High Signal ◽  
Resonance Imaging ◽  
White Matter Changes ◽  
Intensity Changes ◽  
Brain Avms

Abstract OBJECTIVE Perinidal high-signal-intensity changes on T2-weighted magnetic resonance imaging can be seen surrounding radiosurgically treated brain arteriovenous malformations (AVM). Occasionally, these signal intensity changes develop far beyond the irradiated volume. A retrospective analysis of both the pre- and postradiosurgery magnetic resonance imaging and angiographic studies was performed to analyze the cause of these extensive perinidal white matter changes. METHODS The pre- and postradiosurgical magnetic resonance imaging and angiographic studies of 30 patients with T2 high-signal-intensity changes surrounding a brain AVM were analyzed retrospectively. Patients were divided into 2 groups on the basis of the extension of the signal intensity changes within or beyond the 10-Gy isodose area. The angiographic analysis was focused on the venous drainage pattern (deep versus superficial), venous stenosis, and the number of draining veins before and after radiosurgery. In addition, the obliteration rate was determined for the 2 subgroups. RESULTS Fourteen patients (47%) showed high-signal-intensity changes far beyond the 10-Gy isodose area. A single draining vein was more often present in these patients with extensive T2 hyperintensity signal changes than in the other group. Obliteration was achieved in 12 (88%) of 14 patients with extensive signal intensity changes, as opposed to 8 (50%) of 16 patients in the other group. CONCLUSION High-signal-intensity changes after radiosurgery for brain AVMs, far beyond the 10-Gy isodose area on T2-weighted images, are especially seen in brain AVMs draining through a single vein. The higher occlusion rate of brain AVMs under these circumstances is well appreciated.

Added Value of Thoracic Magnetic Resonance Imaging in the Differential Diagnosis Between Peripheral Lung Cancer and Progressive Massive Fibrosis of Coal Silicosis

2020 ◽  
Vol 10 (4) ◽  
pp. 974-977
Author(s):  
Peng Du ◽  
Zi-Wei Guo ◽  
Wei Mao ◽  
Hai-Yan Zhang ◽  
Quan Wang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Lung Cancer ◽  
Differential Diagnosis ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
High Signal Intensity ◽  
High Signal ◽  
Resonance Imaging ◽  
Peripheral Lung ◽  
Progressive Massive Fibrosis

To compare the thoracic magnetic resonance imaging (TMRI) features between peripheral lung cancer (PLC) and progressive massive fibrosis (PMF) of coal silicosis (CS), and to excavate information of differential diagnostic value. 68 patients with PLC (68 lesions) were selected as lung cancer group (LCG), and 50 patients with PMF of CS (78 lesions) were selected as coal silicosis group (CSG). TMRI was performed in both groups, and T1-weighted imaging (T1WI), T2-weighted imaging (T2WI) and Spectral pre-saturated inversion recovery (SPIR) were used. The differences and characteristics of TMRI between the two groups were analyzed. 55 cases of pulmonary masses (PM) in LCG showed iso-signal intensity on T1WI (80.9%), and 63 cases showed high-signal intensity on T2WI and SPIR (92.6%); 65 cases of PMF in CSG showed iso-signal intensity on T1WI (83.5%), and high-signal intensity on T2WI and SPIR was found in 4 cases (5.1%), but 67 cases showed low-signal intensity (85.9%). PMF in CSG with high-signal intensity on T2WI and SPIR were significantly lower than PM in LCG(P < 0.1). Compared with TMRI of PLC showed high-signal intensity on T2WI and SPIR, PMF in CS showed low-signal intensity on T2WI and SPIR. This feature is of important significance in differential diagnosis.

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