Magnetic resonance imaging characteristics of ischemic brain infarction over time in a canine stroke model

Background: Type 2 diabetes mellitus (T2DM) and hypertension (HTN) are risk factors for the spectrum of brain lesions. In this paper, we studied the impact of T2DM and HTN on the incidence of several brain lesions diagnosed with magnetic resonance imaging (MRI). Methods and Results: This retrospective, single-center study was conducted at Royal Care International Hospital (Khartoum, Sudan) from January 2016 to December 2016 and included 80 patients (40 male and 40 female, aged between 20 years and 90 years) with suspected brain disorders. MRI brain examinations were conducted on a 1.5 Tesla MRI system (Toshiba Medical Systems, Tokyo, Japan). The following sequences were analyzed: T1-weighted imaging (T1WI), T2-weighted imaging (T2WI), fluid-attenuated inversion recovery (FLAIR), and diffusion-weighted imaging (DWI). Brain lesions were characterized by magnetic imaging spectroscopy and histopathological analysis. Binary logistic regression analysis was used to establish a mathematical model of the relationship between T2DM/HTN and the prevalence of brain lesions. Among 80 patients, HTN, T2D, and the combination of T2D and HTN were identified in 18(22.5%), 9(11.2%), and 11(13.8%) patients, respectively. Brain lesions were found in 48(60%) patients and were most prevalent in the age group of 66-80 years. The brain lesions included ischemic brain infarction (IBI) (22.5%), brain tumors (11.2%), cerebral hemorrhages (6.2%), brain atrophy (BA) (1.2 %), IBI with BA (16.2%), and brain metastases (2.5%). Regression analysis showed that HTN and T2DM were associated with significantly higher ORs for brain lesions ([OR=2.459, 95% CI: 1.673–3.614, P<0.001] and [OR=1.507, 95% CI: 1.067–2.128, P= 0.042], and [OR=1.078, 95% CI:1.033–1.124, P=0.001], respectively). HTN was associated with significantly higher OR for ischemic brain infarction (OR=7.404, 95% CI: 2.600–21.081, P<0.001). Conclusion: The study showed a significant interaction between HTN and T2DM on the prevalence of brain lesions, especially ischemic brain infarction and brain atrophy.

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Morel-Lavallee Syndrome: A Rare Tumefactive Lesion

European Journal of Case Reports in Internal Medicine ◽

10.12890/2020_001910 ◽

2020 ◽

Author(s):

Mohamed Labied ◽

Siham Salam ◽

Salma Jabri ◽

Dalal Laoudiyi ◽

Kamilia Chbani ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Lower Leg ◽

Differential Diagnoses ◽

Fibrous Capsule ◽

Imaging Findings ◽

Resonance Imaging ◽

Imaging Characteristics ◽

French Surgeon ◽

Over Time

First described by the French surgeon Maurice Morel-Lavallee in 1853, Morel-Lavallee syndrome (MLS) is a serolymphatic effusion resulting from tangential injury to richly vascularized tissues. The imaging characteristics may be variable over time due to lesion progression and the eventual organization of a fibrous capsule. We report a case of extensive MLS in the lower leg of a 12-year-old child. We discuss the ultrasound and magnetic resonance imaging findings and describe the differential diagnoses.

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Alterations in magnetic resonance imaging characteristics of bioabsorbable magnesium screws over time in humans: a retrospective single center study

Innovative Surgical Sciences ◽

10.1515/iss-2021-0032 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Lena Sonnow ◽

Andreas Ziegler ◽

Gesa H. Pöhler ◽

Martin H. Kirschner ◽

Maximilian Richter ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Proton Density ◽

Artifact Reduction ◽

Single Center ◽

Resonance Imaging ◽

Imaging Characteristics ◽

Single Center Study ◽

Over Time ◽

Center Study

Abstract Objectives This study aimed to examine the alterations in magnetic resonance imaging (MRI) characteristics of bioabsorbable magnesium (Mg) screws over time in a single center study in humans. Methods Seventeen patients who underwent medial malleolar (MM) fracture or osteotomy fixation using bioabsorbable Mg screws and had at least one postoperative MRI were included in this retrospective study. Six of them had more than one MRI in the postoperative period and were subject of the artifact reduction measurements. 1.5T or 3T MRI scans were acquired in different periods in each patient. The size and extent of the artifact were assessed independently by two experienced radiologists both quantitatively (distance measurement) and qualitatively (Likert scale). Results In the quantitative measurements of the six follow-up patients the screw’s signal loss artifact extent significantly decreased over the time, regardless of the MRI field strength (p<0.001). The mean artifact reduction was 0.06 mm (95% confidence interval [CI]: 0.05–0.07) for proton density weighted [PDw] and 0.04 mm (95% CI: 0.03–0.05) for T1 weighted (T1w) sequences per week. The qualitative assessments similarly showed significant artifact reduction in all MRI sequences. Different imaging findings, like bone marrow edema (BME), liquid collections, and gas formation were reported. The overall inter-reader agreement was high (κ=0.88, p<0.001). Conclusions The time-dependent artifact reduction of Mg screws in postoperative controls might indicate the expected self-degradation of the Mg implants. In addition, different MRI findings were reported, which are characteristic of Mg implants. Further MRI studies are required to get a better understanding of Mg imaging properties.

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Faculty Opinions recommendation of Computed tomography and magnetic resonance imaging characteristics of acute invasive fungal sinusitis.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.716947865.792302856 ◽

2012 ◽

Author(s):

Erik K Weitzel ◽

Tom Willson

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Magnetic Resonance ◽

Fungal Sinusitis ◽

Resonance Imaging ◽

Invasive Fungal Sinusitis ◽

Imaging Characteristics

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Imaging findings of trichilemmal cyst and proliferating trichilemmal tumour

The Neuroradiology Journal ◽

10.1177/19714009211017789 ◽

2021 ◽

pp. 197140092110177

Author(s):

Masaya Kawaguchi ◽

Hiroki Kato ◽

Natsuko Suzui ◽

Tatsuhiko Miyazaki ◽

Hiroyuki Tomita ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Magnetic Resonance ◽

Resonance Imaging ◽

Hounsfield Units ◽

Soft Tissue Density ◽

Cutaneous Lesions ◽

Imaging Characteristics ◽

Trichilemmal Cyst ◽

T1 Hyperintensity

Purpose The purpose of this study was to evaluate computed tomography and magnetic resonance imaging of benign trichilemmal cysts and proliferating trichilemmal tumours. Methods Nineteen histologically confirmed cutaneous lesions with trichilemmal keratinisation (12 trichilemmal cysts and seven proliferating trichilemmal tumours) were enrolled. Among them, 10 lesions (six trichilemmal cysts and four proliferating trichilemmal tumours) were examined by computed tomography, while 13 lesions (eight trichilemmal cysts and five proliferating trichilemmal tumours) were examined by magnetic resonance imaging. Computed tomography and magnetic resonance imaging characteristics were retrospectively reviewed. RESULTS Sixteen lesions (84%, 10 trichilemmal cysts and six proliferating trichilemmal tumours) occurred on the scalp. Lobulated margins were observed in five lesions (26%, three trichilemmal cysts and two proliferating trichilemmal tumours). With respect to computed tomography attenuation, calcification (>200 Hounsfield units) was observed in seven lesions (70%, five trichilemmal cysts and two proliferating trichilemmal tumours), hyperdense areas (≥80 and ≤200 Hounsfield units) in six (60%, three trichilemmal cysts and three proliferating trichilemmal tumours), and soft tissue density areas (<80 Hounsfield units) in nine (90%, five trichilemmal cysts and four proliferating trichilemmal tumours). On T1-weighted images, intratumoral hyperintensity was only observed in eight trichilemmal cysts but no proliferating trichilemmal tumours (100% vs. 0%, P<0.01). On T2-weighted images, hypointense rim and intratumoral hypointensity was observed in all 13 lesions (100%, eight trichilemmal cysts and five proliferating trichilemmal tumours), and linear or reticular hypointensity was observed in 10 (77%, six trichilemmal cysts and four proliferating trichilemmal tumours). Conclusion Trichilemmal cysts and proliferating trichilemmal tumours predominantly occurred on the scalp with calcification, and usually exhibited linear or reticular T2 hypointensity. Intratumoral T1 hyperintensity may be a useful imaging feature for differentiating trichilemmal cysts from proliferating trichilemmal tumours.

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Parallel Imaging Artifacts in Body Magnetic Resonance Imaging

Canadian Association of Radiologists Journal ◽

10.1016/j.carj.2009.02.036 ◽

2009 ◽

Vol 60 (2) ◽

pp. 91-98 ◽

Cited By ~ 8

Author(s):

Patricia Noël ◽

Roland Bammer ◽

Caroline Reinhold ◽

Masoom A. Haider

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Parallel Imaging ◽

Negative Impact ◽

Significant Advance ◽

Resonance Imaging ◽

Imaging Characteristics ◽

Coil Geometry ◽

Body Magnetic Resonance Imaging ◽

Time Required

Objective To familiarize the reader with the fundamental concepts of partial parallel imaging (PPI); to review the technical aspects of PPI including calibration scan, coil geometry, and field of view (FOV); and to illustrate artifacts related to parallel imaging and describe solutions to minimize their negative impact. Results PPI has led to a significant advance in body magnetic resonance imaging by reducing the time required to generate an image without loss of spatial resolution. Although PPI can improve image quality, it is not free of artifacts, which can result in significant image degradation. Knowledge of these artifacts and how to minimize their effect is important to optimize the use of parallel imaging for specific body magnetic resonance imaging applications. Conclusions The reader will be introduced to the fundamental principles of PPI. Common imaging characteristics of PPI artifacts will be displayed with an emphasis on those seen with image-based methods, the principles behind their generation presented, and measures to minimize their negative impact will be proposed.

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Granular cell tumor of the extremity: magnetic resonance imaging characteristics with pathologic correlation

Skeletal Radiology ◽

10.1007/s00256-005-0925-8 ◽

2005 ◽

Vol 34 (10) ◽

pp. 625-631 ◽

Cited By ~ 31

Author(s):

Marcia F. Blacksin ◽

Lawrence M. White ◽

Meera Hameed ◽

Rita Kandel ◽

Francis R. Patterson ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Granular Cell Tumor ◽

Granular Cell ◽

Cell Tumor ◽

Resonance Imaging ◽

Pathologic Correlation ◽

Imaging Characteristics

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Magnetic resonance imaging characteristics of children and adults with paediatric-onset multiple sclerosis

Brain ◽

10.1093/brain/awp278 ◽

2009 ◽

Vol 132 (12) ◽

pp. 3392-3400 ◽

Cited By ~ 77

Author(s):

E. A. Yeh ◽

B. Weinstock-Guttman ◽

M. Ramanathan ◽

D. P. Ramasamy ◽

L. Willis ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Multiple Sclerosis ◽

Magnetic Resonance ◽

Resonance Imaging ◽

Imaging Characteristics

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Diagnostic value of magnetic resonance imaging in the analysis of ameloblastoma: report of two cases

Brazilian Dental Science ◽

10.14295/bds.2019.v22i3.1763 ◽

2019 ◽

Vol 22 (3) ◽

pp. 425-431

Author(s):

Neiandro Santos Galvão ◽

Antonione Santos Bezerra Pinto ◽

Alan Leandro Carvalho Farias ◽

André Luiz Ferreira Costa ◽

Sérgio Lúcio Pereira de Castro Lopes ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Differential Diagnosis ◽

Magnetic Resonance ◽

Signal Intensity ◽

Diagnostic Value ◽

Resonance Imaging ◽

Intermediate Signal Intensity ◽

Additional Information ◽

Imaging Characteristics ◽

Magnetic Resonance Imaging Mri

Ameloblastoma is an odontogenic tumor that shares clinical and imaging characteristics with other lesions of the jaws, such as odontogenic keratocyst, which makes the diagnosis difficult. However, in addition to radiographic and tomographic examinations, Magnetic Resonance Imaging (MRI) has been increasingly used, contributing with relevant additional information about the differentiation between solid and liquid components of the lesion. This case report was conducted to present two variations of ameloblastoma and discuss the radiographic, tomographic and MRI contribution in the differential diagnosis between ameloblastoma and odontogenic keratocyst.The signal intensity in T1-weighted MRI revealed internal fluid content in both cases, which was important in the differential diagnosis with other intraosseous lesions such as odontogenic keratocysts. This is probably due to the presence of keratin that increases the viscosity of the content and also for an intermediate signal intensity signal in T2-weighted MRI. Therefore, MRI revealed important internal characteristics of the reported lesions, which was very useful in the establishment of the differential diagnosis with other lesions.

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