AJNR. American journal of neuroradiology
-
AJNR Am J Neuroradiol · Jun 2007
Comparative StudyEmergent headaches during pregnancy: correlation between neurologic examination and neuroimaging.
Emergent evaluation of the pregnant headache patient requires rational selection of acute neuroimaging studies, yet guidelines do not exist. We investigated the demographic and clinical features that are predictive of intracranial pathologic lesions on neuroimaging studies in pregnant women with emergent headaches. ⋯ Emergent neuroimaging studies may reveal an underlying headache etiology in 27% of pregnant women. Further research with a larger sample size is needed to determine what clinical factors are predictive of a pathologic condition on neuroimaging studies.
-
AJNR Am J Neuroradiol · Jun 2007
Pseudolesions arising from unfolding artifacts in diffusion imaging with use of parallel acquisition: origin and remedies.
Diffusion imaging acquired with echo-planar imaging (EPI) is usually performed with parallel imaging to reduce geometric distortions, especially at high fields. This study reports the occurrence of pseudolesions in EPI with parallel imaging. The unfolding artifacts are attributed as arising from a mismatch between RF sensitivity profiles and distorted acquisition data in the presence of susceptibility effects, plus strong signals on the b=0 images. Examples of pseudolesions from the eyeballs are shown, and remedies are suggested.
-
AJNR Am J Neuroradiol · May 2007
Case ReportsLightning strike: a rare cause of bilateral ossicular disruption.
Otologic injury associated with fatal and nonfatal lightning strikes has been sporadically reported in the literature. The most common acoustic insult is a conductive hearing loss secondary to rupture of the tympanic membrane. Although conjecture has been made of the theoretic possibility of ossicular injury from lightning strike, to our knowledge, none has been demonstrated intraoperatively or postmortem. We report the first documented case of ossicular disruption in a lightning-strike victim.
-
AJNR Am J Neuroradiol · May 2007
Comparative Study Clinical TrialMR angiography of dural arteriovenous fistulas: diagnosis and follow-up after treatment using a time-resolved 3D contrast-enhanced technique.
Digital subtraction angiography (DSA) is the method of reference for imaging of dural arteriovenous fistula (DAVF). The goal of this study was to analyze the value of different MR images including 3D contrast-enhanced MR angiography (MRA) with a high temporal resolution in diagnostic and follow-up imaging of DAVFs. ⋯ In this study, TR 3D MRA proved reliable in detecting DAVFs and suitable for follow-up imaging. The technique allowed--within limitations--to grade DAVFs. Although 3D TOF MRA can depict signs of DAVFs, its value for follow-up imaging is limited.
-
AJNR Am J Neuroradiol · May 2007
Controlled Clinical TrialProton MR spectroscopy and MRI-volumetry in mild traumatic brain injury.
More than 85% of brain traumas are classified as "mild"; MR imaging findings are minimal if any and do not correspond to clinical symptoms. Our goal, therefore, was to quantify the global decline of the neuronal marker N-acetylaspartate (NAA), as well as gray (GM) and white matter (WM) atrophy after mild traumatic brain injury (mTBI). ⋯ WBNAA detected neuronal/axonal injury beyond the minimal focal MR-visible lesions in mTBI. Combined with GM atrophy, the findings may provide further, noninvasive insight into the nature and progression of mTBI.