DTI pattern 2: abnormal (low) anisotropy, normal location and orientation.A–D, T2-weighted MR image (A), contrast-enhanced T1-weighted MR image (B), FA.

Slides:

Advertisements

Similar presentations

Axial T1-weighted image after contrast administration (A) and a FLAIR image (B) demonstrating a left parietal subcortical DVA with deep venous drainage.

Advertisements

A, Brachial neuritis with long thoracic nerve neuritis.

Patient 1. Patient 1. A 40-year-old man with mild ataxia and homonymous hemianopia. CRP level was initially 0.5 mg/dL and did not change in the clinical.

Image shows appearance of septum within dural sinus in a 68-year-old woman with normal results of an MR imaging examination. Image shows appearance of.

Acute osteopenic compression fracture of the L1 vertebral body simulating metastasis. Acute osteopenic compression fracture of the L1 vertebral body simulating.

56-year-old woman with diffuse large B cell lymphoma

A–C, Case 1. A–C, Case 1. Typical white matter changes involving the corpus callosum and the pyramidal tracts (A and C, arrows), dilation of the lateral.

Photograph, CT, and MR imaging of the patient.

The case of a 64-year-old man with histologically confirmed pituitary adenoma without evidence of hemorrhage or infarction.A, Coronal spin-echo T1-weighted.

A, Axial source image from a contrast-enhanced MRA unambiguously demonstrates a tiny (

Diffusion-weighted (TR = 3900, TE = 94, B = 1000, number of gradient directions = 90) imaging (A) with corresponding apparent diffusion coefficient map.

Typical MR images of the L2 vertebral body metastasis with pathologic fractures reveal a sharply defined lytic lesion. Typical MR images of the L2 vertebral.

FLAIR scan, FA map, and fiber tracking in a 38-year-old patient with TBI who was imaged 2 weeks after the initial trauma. FLAIR scan, FA map, and fiber.

Representative DTI fractional anisotropy (FA) and color vector map images of patient 9 with a left parietal angioma. Representative DTI fractional anisotropy.

Patient 1, a 15-day-old neonate who presented with encephalopathy

A 50-year-old woman with fever and severe hypertension.

Patient 9. Patient 9. A 31-year-old man with mental status changes and seizure activity.A, T2-weighted axial MR image shows bilateral frontal and right.

MR images obtained through the pituitary gland show diffuse enlargement of the pituitary gland. MR images obtained through the pituitary gland show diffuse.

Geniculocalcarine tract (optic radiation), axial view

A, In a patient with a history of breast cancer surgery and radiation treatment with right-arm weakness, axial T2WI shows diffuse thickening of the right.

Normal apical ligament (arrow) and normal anterior atlantoaxial ligament (arrowhead) in the diagram (A) and the midsagittal T2-weighted MR image (B) in.

Sagittal T1-weighted (A) and coronal T2-weighted (B) MR images show the frontoparietal intracalvarial mass lesion that was hypointense on T1-(A) and hyperintense.

TBSS results. TBSS results. A, TBSS-derived t-map of decreased fractional anisotropy in the anoxic brain injury group relative to the neurotypical control.

A 62-year-old man with subacute cognitive impairment and seizures.

A, Sagittal view through the brain stem and cervical spinal cord shows the extent of T2 hyperintensities involving the pyramidal tract and posterior columns.

Patient 12. Patient 12. A 43-year-old woman with headache, blurred vision, and mental status change.A, T2-weighted axial MR image shows bilateral centrum.

Type 1 pedicle marrow signal intensity changes associated with degenerative facet disease. Type 1 pedicle marrow signal intensity changes associated with.

Isolated inflammatory scleritis: orbital MR imaging.

Coronal (A) and axial (B) contrast-enhanced T1-weighted MR images and an axial DWI (C) and ADC map (D) in a patient with primary dural B-cell lymphoma.

Trends in the use of head CT and advanced imaging in patients treated with IV thrombolysis from 2008 to Trends in the use of head CT and advanced.

Midline (A) and parasagittal (B) non-contrast-enhanced T1-weighted MR images (500/11/1) in a 73-year-old healthy woman show the normal high signal intensity.

Axial T2-weighted MR imaging at the level of the internal auditory canals, demonstrating a large, homogeneous mass filling the right internal auditory.

Case 1, a 69-year-old woman. Case 1, a 69-year-old woman. MR images of the thoracolumbar spine, obtained 10 hours after sudden-onset severe back pain,

Corpus callosum, axial view

Coronal gadolinium-enhanced T1-weighted image (TR/TE/NEX, 500/15/2) illustrates the common appearance of V2 (arrows) within the foramen rotundum as central.

Diffusion findings in acute-stage ANE in a 2-year-old girl.

A 56-year-old man with fever for 1 week.

DTI TBSS results for the comparison of FA values between 2-week-old neonates born by cesarean delivery or vaginal delivery in cohort 1. DTI TBSS results.

A 61-year-old male patient with right hemiparesis imaged at 2

Patient 2. Patient 2. A 31-year-old man with fever, seizures, and weakness of the left upper extremity. DW images were superior to conventional MR images.

Coronal T1-weighted contrast-enhanced MR image obtained in January of 1999 at the onset of right hearing impairment shows increased enhancement of the.

A 47-year-old woman with a history of alcohol abuse presented with ataxia, changes in consciousness, and ocular abnormalities. A 47-year-old woman with.

52-year-old African-American man with seizure disorder.

DTI pattern 1: normal anisotropy, abnormal location or orientation

Sequential diffusion-weighted images show bright basal ganglia as the initial finding after anoxia. Sequential diffusion-weighted images show bright basal.

Sagittal T1-weighted MR image of the pituitary gland in a term neonate (born at gestational week 38) obtained near term (corrected age of 39 weeks; 7 days.

Radiation therapy-induced cyst 89 months after AVM treatment

MR images of the brain (axial sections, fluid-attenuated reversion recovery sequences) show the symmetric hyperintensities (arrows) involving the pyramidal.

A, Illustration shows the anatomic relationships of several WM fiber tracts in the coronal plane. A, Illustration shows the anatomic relationships of several.

Wernicke encephalopathy in a 75-year-old man.

A, Axial T2-weighted image (3500/90/2) shows a well-defined deep right occipital white matter lesion (asterisk) and a subcortical linear hyperintensity.

Representative quantitative maps of a patient with brain metastasis.

Axial T2-weighted MR image shows normal flow void in the right internal jugular vein (arrows), whereas flow-related enhancement can be seen in the left.

Intergroup comparisons of fractional anisotropy values using TBSS

MR images in a 69-year-old woman with cervical and thoracic back pain.

Images of a 12-year-old male patient with X-linked ALD with stable neurologic function. Images of a 12-year-old male patient with X-linked ALD with stable.

A and B, Illustration (A) and gross dissection, medial view (B) of the corona radiata.C, Directional map, three adjacent parasagittal sections, with corona.

A, Axial T1- weighted MR image shows a predominantly isointense lesion in the right parietal bone. A, Axial T1- weighted MR image shows a predominantly.

Patient 2. Patient 2. Additional MR images.A–C, Follow-up image (A) obtained 15 days after surgical intervention shows reduced size of the abscess cavity.

MR imaging−based modalities in neuroimaging research discussed in this review. MR imaging−based modalities in neuroimaging research discussed in this review.

Persistent diffusion abnormalities in the brain stem of patient 2.

Metastatic adenocarcinoma.

A–C, Axial T2-weighted images 7 days after the ictus, demonstrating punctate hyperintensities throughout the white matter, on a background of slightly.

Axial DWIs at the level of the corona radiata obtained at 2 different time points (A and B) show recurrent periventricular infarcts. Axial DWIs at the.

Case 2: 52 year-old man with intracranial injuries sustained in a motor vehicle accident. Case 2: 52 year-old man with intracranial injuries sustained.

Superior longitudinal fasciculus, sagittal view.

Isolated restricted diffusion in a patient who recovered without residual symptoms.A, DW image shows asymmetric (right greater than left) high signal intensity.

Twelve-year-old girl with coinfection of JE and NCC (patient 5).

MRN appearance of a normal sciatic nerve.

LEC of the right parotid gland in a 38-year-old man with painless masses in the right parotid regions for approximately 3 years. LEC of the right parotid.

Presentation transcript:

DTI pattern 2: abnormal (low) anisotropy, normal location and orientation.A–D, T2-weighted MR image (A), contrast-enhanced T1-weighted MR image (B), FA map (C), and directional map (D). DTI pattern 2: abnormal (low) anisotropy, normal location and orientation.A–D, T2-weighted MR image (A), contrast-enhanced T1-weighted MR image (B), FA map (C), and directional map (D). The homogeneous region of hyperintensity on the T2-weighted image represents vasogenic edema surrounding a small metastasis (on another section, not shown). Despite diminished anisotropy in this region (darker region outlined on FA map) and diminished color brightness on directional map, the involved fiber tracts retain their normal color hues on the directional map (superior longitudinal fasciculus, green, arrow; corona radiata, blue, arrowhead). This preservation of normal color hues despite a substantial decrease in anisotropy is consistent with the abnormality of vasogenic edema, which enlarges the extracellular space (allowing less restricted diffusion perpendicular to axonal fibers, thus reducing the anisotropy) without disrupting cellular membranes, leaving their directional organization intact. It is not yet known to what extent this pattern is specific for edema, however. Brian J. Jellison et al. AJNR Am J Neuroradiol 2004;25:356-369 ©2004 by American Society of Neuroradiology