scholarly journals Hemorrhage in the Wall of Pyogenic Brain Abscess on Susceptibility Weighted MR Sequence: A Report of 3 Cases

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Krishnamoorthy Thamburaj ◽  
Amit K. Agarwal ◽  
Shyamsunder B. Sabat ◽  
Dan T. Nguyen
Keyword(s):  
Brain Abscess ◽  
Diffusion Weighted Imaging ◽  
Stereotactic Biopsy ◽  
Restricted Diffusion ◽  
Susceptibility Weighted Imaging ◽  
3T Mri ◽  
Weighted Sequence ◽  
Diffusion Weighted ◽  
Pyogenic Abscess

Background and Purpose. In pyogenic brain abscess, hemorrhage in the walls is considered exceptional. Recently, hemorrhagic changes in the walls of pyogenic abscess have been demonstrated on susceptibility weighted imaging with 3T MRI. Here, we report hemorrhagic changes in the walls of pyogenic brain abscess on susceptibility weighted imaging with 1.5T MRI.Method. MRI of brain was done using 1.5T MRI with diffusion weighted sequence, susceptibility weighted sequence, and other standard sequences in 3 consecutive cases of pyogenic brain abscess. Stereotactic biopsy and cultures were obtained in 2 cases. One case was treated empirically with antibiotics.Results. Susceptibility sequence demonstrated hemorrhage in the wall of brain abscess in all three cases. All three cases also demonstrated restricted diffusion on diffusion weighted imaging.Conclusion. Susceptibility weighted imaging can demonstrate hemorrhagic changes in the walls of pyogenic brain abscess on 1.5T MRI. Presence of hemorrhage in the walls of ring enhancing lesions should not automatically lead to a diagnosis of tumor.

scholarly journals Comparison between turbo spin-echo and echo planar diffusion-weighted imaging of the female pelvis with 3T MRI

2021 ◽  
Vol 10 (2) ◽  
pp. 205846012199473
Author(s):  
Takeshi Yoshizako ◽  
Rika Yoshida ◽  
Hiroya Asou ◽  
Megumi Nakamura ◽  
Hajime Kitagaki
Keyword(s):  
Image Quality ◽  
Diffusion Weighted Imaging ◽  
Spin Echo ◽  
Turbo Spin Echo ◽  
Female Pelvis ◽  
3T Mri ◽  
Turbo Spin ◽  
Diffusion Weighted ◽  
Adc Values ◽  
Echo Planar

Background Echo-planar imaging (EPI)-diffusion-weighted imaging (DWI) may take unclear image affected by susceptibility, geometric distortions and chemical shift artifacts. Purpose To compare the image quality and usefulness of EPI-DWI and turbo spin echo (TSE)-DWI in female patients who required imaging of the pelvis. Material and Methods All 57 patients were examined with a 3.0-T MR scanner. Both TSE- and EPI-DWI were performed with b values of 0 and 1000 s/mm2. We compared geometric distortion, the contrast ratio (CR) of the myometrium to the muscle and the apparent diffusion coefficient (ADC) values for the myometrium and lesion. Two radiologists scored the TSE- and EPI-DWI of each patient for qualitative evaluation. Results The mean percent distortion was significantly smaller with TSE- than EPI-DWI ( p = 0.00). The CR was significantly higher with TSE- than EPI-DWI ( p = 0.003). There was a significant difference in the ADC value for the uterus and lesions between the EPI- and TSE-DWI ( p < 0.05). Finally, the ADC values of cancer were significantly different from those for the uterus and benign with both the two sequences ( p < 0.05). The scores for ghosting artifacts were higher with TSE- than EPI-DWI ( p = 0.019). But there were no significant differences between TSE- and EPI-DWI with regard to image contrast and overall image quality. Conclusion TSE-DWI on the female pelvis by 3T MRI produces less distortion and higher CR than EPI-DWI, but there is no difference in contrast and image quality.

LIMITATIONS OF DIFFUSION-WEIGHTED IMAGING IN THE DIAGNOSIS OF POSTOPERATIVE INFECTIONS

Neurosurgery ◽  
2008 ◽  
Vol 62 (3) ◽  
pp. 577-583 ◽  
Author(s):  
Christopher J. Farrell ◽  
Brian L. Hoh ◽  
Mary L. Pisculli ◽  
John W. Henson ◽  
Fred G. Barker ◽  
...  
Keyword(s):  
False Positive ◽  
Diffusion Weighted Imaging ◽  
Postoperative Infection ◽  
False Negative ◽  
False Negative Rate ◽  
Restricted Diffusion ◽  
Postoperative Infections ◽  
Negative Rate ◽  
Diffusion Weighted ◽  
Diagnosis Of Infection

Abstract OBJECTIVE Diffusion-weighted imaging (DWI) has assumed a rapidly emerging role in the diagnosis of intracranial infection; however, its usefulness in the recognition of postoperative infection has been largely unexplored. We sought to determine the ability of DWI to accurately detect a broad range of postneurosurgical infections as well as identify individual factors that may limit its applicability. METHODS We retrospectively identified 65 patients who had undergone surgery for the confirmed diagnosis of infection between August 2001 and February 2005 and had received preoperative magnetic resonance imaging evaluation, including DWI. Fifty patients developed infections after a primary neurosurgical procedure (“postoperative” infections), whereas 15 infections occurred without antecedent intervention (“spontaneous” infections). Logistic regression analysis was used to identify factors associated with false-negative DWI findings. Additionally, we investigated the false-positive rate of DWI by retrospectively reviewing a series of 30 consecutive patients who underwent craniotomy and received postoperative DWI. RESULTS Spontaneously developing cranial infections exhibited evidence of restricted diffusion in 14 out of 15 (93%) patients; however, infections that occurred postoperatively were associated with a significant false-negative rate using DWI (36%; P &lt; 0.01). Within the subset of patients with postoperative infection, location of infection significantly correlated with the DWI false-negative rate. Infections located extradurally were less likely to demonstrate restricted diffusion compared with those located primarily within the subdural or intraparenchymal spaces. Additionally, false-positive DWI findings were observed in 11 of the 30 patients (37%) who had DWI obtained postoperatively in the absence of infection. CONCLUSION Utilization of DWI for the diagnosis of infection after primary neurosurgical intervention is associated with an elevated false-negative rate. The absence of restricted diffusion is not sufficient to exclude the presence of pyogenic postcraniotomy infection and should not be used as the principle determinant of patient management in this clinical setting.

Atypical pyogenic brain abscess evaluation by diffusion-weighted imaging: diagnosis with multimodality MR imaging

2015 ◽  
Vol 33 (10) ◽  
pp. 668-671 ◽  
Author(s):  
Mustafa Ozbayrak ◽  
Ozden Sila Ulus ◽  
Mehmet Zafer Berkman ◽  
Sesin Kocagoz ◽  
Ercan Karaarslan
Keyword(s):  
Mr Imaging ◽  
Brain Abscess ◽  
Diffusion Weighted Imaging ◽  
Imaging Diagnosis ◽  
Diffusion Weighted

scholarly journals Distinction of reactive joint fluid from pyogenic abscess by diffusion-weighted imaging

2007 ◽  
Vol 25 (4) ◽  
pp. 859-861 ◽  
Author(s):  
Ji Kang Park ◽  
Bong Soo Kim ◽  
Gukmyung Choi ◽  
Seung Hyoung Kim ◽  
Kwang-Bok Lee ◽  
...  
Keyword(s):  
Diffusion Weighted Imaging ◽  
Joint Fluid ◽  
Diffusion Weighted ◽  
Pyogenic Abscess

scholarly journals Susceptibility Weighted Imaging in Acute Stroke with Co-morbids: Magnetic Resonance Imaging Protocol Revisited

2019 ◽  
pp. 1-8 ◽  
Author(s):  
Fatima Mubarak ◽  
Muhammad Danish Barakzai
Keyword(s):  
Signal Intensity ◽  
Diffusion Weighted Imaging ◽  
Surrogate Marker ◽  
Rank Correlation ◽  
Acute Stage ◽  
High Signal ◽  
Susceptibility Weighted Imaging ◽  
Imaging Protocol ◽  
Diffusion Weighted ◽  
Acute Infarct

Introduction: We aim to investigate ischemic penumbra using Diffusion weighted imaging- Susceptibility weighted imaging mismatch using DWI Alberta Stroke Program Early Computed tomography Stroke Score scoring in patients with multiple co morbid. Methods: From January 2011 to December, 2017; 70 consecutive patients (50 men, 20 women; mean age 64.5; range 45-82 years) with acute infarct on Diffusion weighted imaging (DWI) were selected for the study. Stroke protocol performed including DWI and susceptibility weighted imaging (SWI) on first day and repeat within three days. All initial MR images were interpreted by one Neuroradiologist with more than ten years blind to the clinical findings of each patient. The definition of an acute infarct area was high signal intensity on DWI with dark signal intensity on Apparent diffusion weighted imaging (ADC). The infarct extent was scored using the Alberta Stroke Program Early CT Score (ASPECTS) system. Infarct growth was defined as any new or larger lesion on the second DWI. For correlation with infarct growth, the same topographic system was used to record the extent of the Prominent vessel sign (PVS) on SWI. Spearman’s rank correlation test was used to examine the correlations between PVS score and infarct growth score. Regression was computed, with P<0.05 considered significant. Results: The study included 12 women and 10 men, (mean age 67.1 years). MRI images were initially acquired as stroke protocol (mean 12 hours) in acute stage and the next MRI was done within 3 days after the acute stage. 9 patients had right sided and 13 patients had left sided MCA territory infarct, the mean DWI-ASPECTS score was 4.3 (range 0–9).  PVS was detected in 15 patients (mean score 4.1, range 0–10). Out of 22 patients 9 patients showed no evolution in infarct however in 13 patients evolution was from (ASPECTS mean score 3.95, range 0–9; mean infarct growth score 7.4, range 0–10). 7 patients devoid of PVS in initial MRI, did not exhibited evolution of infarction. Of 15 patients with PVS on initial MRI, 13 (87%) had infarct growth. Correlation between the evolution in infarct size and PVS score was observed (r = 0.86, P<0.001). Conclusion: PVS seen in infarcted territory is related to poor prognosis and this can be reliably used as a surrogate marker of oxygen extraction in penumbra. SWI can predict tissue at risk and can be a replacement for perfusion scan in clinical scenerio of acute ischaemic infarct.

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