191: Rate of and risk factors for non-visualization of the appendix with magnetic resonance imaging (MRI) in pregnant women with suspected appendicitis

Purpose The objective of the study was to evaluate the performance of magnetic resonance imaging (MRI) for the diagnosis of appendicitis during pregnancy. Methods We conducted a retrospective review of all MRI scans performed at our institution, between 2006 and 2012, for the evaluation of suspected appendicitis in pregnant women. Details of the MRI scans performed were obtained from the radiology information system as well as details of any ultrasounds carried out for the same indication. Clinical and pathological data were obtained by retrospective chart review. Results The study population comprised 63 patients, and 8 patients underwent a second MRI scan during the same pregnancy. A total of 71 MRI scans were reviewed. The appendix was identified on 40 scans (56.3%). Sensitivity of MRI was 75% and specificity was 100% for the diagnosis of appendicitis in pregnant women. When cases with right lower quadrant inflammatory fat stranding or focal fluid, without appendix visualization, were classified as positive for appendicitis, MRI sensitivity increased to 81.3% but specificity decreased to 96.4%. Conclusions MRI is sensitive and highly specific for the diagnosis of appendicitis during pregnancy and should be considered as a first line imaging study for this clinical presentation.

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Subclinical cerebral lesion accumulation on serial magnetic resonance imaging (MRI) in patients with hypertension: risk factors

Acta Neurologica Scandinavica ◽

10.1111/j.1600-0404.1998.tb00646.x ◽

2009 ◽

Vol 97 (4) ◽

pp. 251-256 ◽

Cited By ~ 6

Author(s):

S. Shintani ◽

T. Shiigai ◽

T. Arinami

Keyword(s):

Magnetic Resonance Imaging ◽

Risk Factors ◽

Magnetic Resonance ◽

Cerebral Lesion ◽

Resonance Imaging ◽

Hypertension Risk ◽

Serial Magnetic Resonance Imaging ◽

Magnetic Resonance Imaging Mri

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Amyloid Angiopathy in Brain Hemorrhage: A Postmortem Neuropathological-Magnetic Resonance Imaging Study

Cerebrovascular Diseases ◽

10.1159/000486554 ◽

2018 ◽

Vol 45 (3-4) ◽

pp. 124-131 ◽

Cited By ~ 9

Author(s):

Celine Guidoux ◽

Jean-Jacques Hauw ◽

Isabelle F. Klein ◽

Julien Labreuche ◽

Claudine Berr ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Risk Factors ◽

Magnetic Resonance ◽

Histological Analysis ◽

Imaging Study ◽

Control Group ◽

Amyloid Angiopathy ◽

Resonance Imaging ◽

Significant Difference ◽

Magnetic Resonance Imaging Mri

Background: Risk factors for intracerebral hemorrhage (ICH) include hypertension and cerebral amyloid angiopathy (CAA). The objective of this study was to determine the autopsy prevalence of CAA and the potential overlap with other risk factors among patients who died from ICH and also the correlation of CAA with cerebral microbleeds. Methods: We analyzed 81 consecutive autopsy brains from patients with ICH. Staining for CAA detection was performed. We used an age- and sex-matched control group of routine brain autopsies of nonneurological patients to determine the frequencies of CAA and hypertension. Postmortem 3D T2-weighted gradient-echo magnetic resonance imaging (MRI) with a 1.5-T magnet was performed in 11 brains with ICH (5 with CAA and 6 without) and histological correlation was performed when microbleeds were detected. Results: Hypertension and CAA were found in 69.1 and 24.7% of cases respectively. Among patients with CAA, 65.0% also had hypertension. The prevalence of CAA was similar among non-hypertensive cases and controls (33.3 and 23.1%; p = 0.54), whereas a significant difference was found between hypertensive cases vs. controls (28.9% vs. 0; p = 0.01). MRI documented 48 microbleeds and all 5 brains with CAA had ≥1 microbleed, compared to 3/6 brains without CAA. Among 48 microbleeds on MRI, 45 corresponded histologically to microbleeds surrounding microvessels (23 <200 µm in diameter, 19 between 200 µm and 2 mm, 3 were hemosiderin granules). Conclusions: Both hypertension and CAA frequently coexist in patients with ICH. MRI-detected microbleeds, proven by histological analysis, were twice as common in patients with CAA as in those with hypertensive ICH.

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Pediatric Anterior Glenohumeral Dislocation Risk Factors Measured on Magnetic Resonance Imaging (mri)

10.1542/peds.141.1_meetingabstract.678 ◽

2018 ◽

Author(s):

Joseph L. Yellin ◽

Peter D. Fabricant ◽

Jason B. Anari ◽

Alexander L. Neuwirth ◽

Theodore J. Ganley ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Risk Factors ◽

Magnetic Resonance ◽

Resonance Imaging ◽

Magnetic Resonance Imaging Mri ◽

Glenohumeral Dislocation

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Retropharyngeal Lymph Node Metastasis Diagnosed by Magnetic Resonance Imaging in Hypopharyngeal Carcinoma: A Retrospective Analysis From Chinese Multi-Center Data

Frontiers in Oncology ◽

10.3389/fonc.2021.649540 ◽

2021 ◽

Vol 11 ◽

Author(s):

Changming An ◽

Ying Sun ◽

Susheng Miao ◽

Xiaoduo Yu ◽

Ye Zhang ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Risk Factors ◽

Lymph Node ◽

Magnetic Resonance ◽

Head And Neck ◽

Primary Tumor ◽

Prognostic Significance ◽

Resonance Imaging ◽

Retropharyngeal Lymph Node ◽

Magnetic Resonance Imaging Mri

BackgroundTo assess the prevalence, risk factors and prognostic significance of retropharyngeal lymph node (RPLN) metastasis diagnosed by magnetic resonance imaging (MRI) in patients with hypopharyngeal squamous cell carcinoma (HPSCC).Methods259 patients from three cancer institutions in China from Jan 2010 to Dec 2018 were analyzed, retrospectively. All the patients had been given pre-treatment magnetic resonance imaging (MRI) of head and neck and were then treated with definitive radiotherapy with or without chemotherapy. Pretreatment diagnostic MRIs were reviewed by a dedicated head and neck radiologist, for the presence or absence of radiographically positive RPLN, cervical LN and tumor invasion.Demographic variables were analysed by descriptive statistics using SPSS 20.0. Predictors of the presence of RPLN and its prognostic significance were examined.ResultsRPLN metastasis was discovered in 44 patients (17%). Logistic analysis showed that posterior pharyngeal wall (PPW) primary tumor; PPW invasion; N2-3; multiple cervical lymph node (LN) involvement (>2 LNs) were associated with RPLN metastasis, with metastasis rates 37%, 30%, 31% and 33% respectively. Patients with RPLN metastasis had a significantly reduced 5-year overall survival (OS) and disease-free survival (DFS) compared to the non-RPLN metastasis group (OS 28% vs. 48%, p=0.001; DFS 25% vs. 41%, p=0.040).ConclusionsRPLN metastasis was not uncommon in HPSCC patients. Risk factors were: PPW primary tumor, PPW invasion and cervical LN status. RPLN metastasis is a poor prognosticator for survival.

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