The diagnostic value of diffusion-weighted magnetic resonance imaging in soft tissue abscesses

Ünal, Özkan; Koparan, Halil Ibrahim; Avcu, Serhat; Kalender, Ali Murat; Kişli, Erol

doi:10.1016/j.ejrad.2009.08.025

Cited by 54 publications

(32 citation statements)

References 20 publications

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“…Restricted diffusion in the mastoid contents was not found in any of the controls, whereas it was detected in 62 % of the AM patients, which is in concordance with previous knowledge on diffusion restriction in purulent secretions [23][24][25]. The mean ADC value of the intramastoid contents was significantly higher in the controls.…”

Section: Discussionsupporting

confidence: 80%

Comparison of MR imaging findings in paediatric and adult patients with acute mastoiditis and incidental intramastoid bright signal on T2-weighted images

et al. 2015

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Section: Discussionsupporting

confidence: 80%

Comparison of MR imaging findings in paediatric and adult patients with acute mastoiditis and incidental intramastoid bright signal on T2-weighted images

et al. 2015

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“…Because of this limitation, DW-MRI was previously only used for brain imaging until the development of fast MRI techniques. The development of echo planar imaging (EPI), one of the fast MRI techniques, eliminated the long imaging time of conventional sequences and the associated artifacts, thus making DW-MRI usable for abdominal examinations (8)(9)(10)(11).…”

Section: Discussionmentioning

confidence: 99%

“…ADC is a quantitative parameter calculated from DW-MRI images and an indicator of the combined effect of water diffusion and capillary perfusion in extracellular and extravascular space (11).…”

Section: Discussionmentioning

confidence: 99%

The value of diffusion weighted MR imaging and apparent diffusion coefficient quantification in the diagnosis of perforated and non-perforated appendicitis

Avcu

Çetin²,

Arslan³

et al. 2012

Diagn Interv Radiol

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ORIGINAL ARTICLE PURPOSE We aimed to evaluate the effectiveness of diffusion-weighted magnetic resonance imaging (DW-MRI) and apparent diffusion coefficient (ADC) values in the diagnosis of acute appendicitis and differentiation of perforated and nonperforated appendicitis cases, with histopathologic correlation. MATERIALS AND METHODSSixty consecutive patients (34 males, 26 females; mean age, 35.6±15.5 years; range, 17-83 years) with a presumptive diagnosis of acute appendicitis were included in this prospective study. With a 1.5 Tesla MRI unit, DW-MRI examinations were performed with b values of 50, 400, and 800 s/mm 2 . The mean ADC values of case and control groups, as well as in perforated and nonperforated groups were compared. RESULTSOf the 60 cases, 44 had a radiological diagnosis of acute appendicitis, and 16 were regarded as normal. Of the 40 patients who underwent surgical operation, 12 had a histopathological diagnosis of perforated appendicitis, and 28 had nonperforated appendicitis. Mean ADC value in patients with acute appendicitis (1.01±0.26×10 -3 mm 2 /s) was lower than the control group (1.85±0.13×10 -3 mm 2 /s) (P < 0.001). Mean ADC value of the perforated group (0.79±0.19×10 -3 mm 2 /s) was lower than the nonperforated group (1.11±0.22×10 -3 mm 2 /s) (P < 0.001). The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy rate of DW-MRI in the diagnosis of acute appendicitis were 97.5%, 100%, 97.5%, 100%, and 98.1%, respectively. CONCLUSION DW-MRI and ADC quantification are effective in the diagnosis of acute appendicitis, both in perforated and nonperforated cases. Magnetic resonance imaging (MRI) is the radiological imaging technique offering the highest soft tissue contrast resolution. Currently, in addition to conventional MRI, other MRI techniques are commonly and routinely used, including diffusion-weighted MRI (DW-MRI). DW-MRI is a functional imaging technique that relies on the measurement of the accelerated or slowed microscopic diffusion movements of protons of water molecules. The images are obtained in short interval times and without the requirement for any contrast medium (1).Recently, studies have reported the use of DW-MRI to show active inflammatory lesions in the bowel. In these reports, the mean apparent diffusion coefficient (ADC) of the inflamed bowel segments were compared with the ADC of normal segments, and statistically significant difference was demonstrated (1, 2). Only one study has been investigated the use of DW-MRI for the diagnosis of patients with acute appendicitis (3). However, this study did not focus on the differential diagnosis of perforated and nonperforated appendicitis cases.The aim of this study was to evaluate the effectiveness of DW-MRI and quantitative measurement of ADC values in the diagnosis of acute appendicitis, and in the differentiation between perforated and nonperforated appendicitis cases, with histopathologic correlation. Materials and methods Patient selectionThis prospective study was performed betw...

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“…8 DWI was included in our protocol to detect purulent secretions and possible intratemporal abscesses. [16][17][18][19][20] On DWI, most patients (93%) showed variable degrees of signal increase in their mastoid effusions (Table 1). Nearly two-thirds (59%) had intramastoid signal intensity higher than that in their brain parenchyma on DWI and low signal on ADC, confirming the true diffusion restriction.…”

Section: Discussionmentioning

confidence: 99%

MR Imaging Features of Acute Mastoiditis and Their Clinical Relevance

Saat

Laulajainen‐Hongisto

Mahmood

et al. 2014

AJNR Am J Neuroradiol

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The diagnostic value of diffusion-weighted magnetic resonance imaging in soft tissue abscesses

Cited by 54 publications

References 20 publications

Comparison of MR imaging findings in paediatric and adult patients with acute mastoiditis and incidental intramastoid bright signal on T2-weighted images

Comparison of MR imaging findings in paediatric and adult patients with acute mastoiditis and incidental intramastoid bright signal on T2-weighted images

The value of diffusion weighted MR imaging and apparent diffusion coefficient quantification in the diagnosis of perforated and non-perforated appendicitis

MR Imaging Features of Acute Mastoiditis and Their Clinical Relevance

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