Axial T2-weighted MRI (A) demonstrates multiple lesions (arrows) with peripheral high signal and central low signal, located predominantly in the cortex and subcortical...

Case I

Axial T2-weighted MR images (A, B) demonstrate well-defined areas of abnormal high signal in the basal...

Case II

Axial T2-weighted MRI (A) demonstrates a dural-based, peripherally hyperintense and centrally hypointense lesion located lateral to the left frontal lobe (arrow).

Axial (B) and coronal (C) T1-weighted MR images postgadolinium demonstrate peripheral enhancement of the lesion (

Axial FLAIR (A) and T2-weighted (B) MR images demonstrate a low signal mass in the right pons (arrows) with...

Axial postcontrast CT (A) and axial (B) and coronal (C) T1-weighted MR images postgadolinium demonstrate enhancement of the perimesencephalic cisterns (arrows), as well as the sylvian and interhemispheric...

Axial T2-weighted MR image (A) demonstrates multiple punctate foci of low signal diffusely distributed in the brain parenchyma (arrowhead).

Axial T1-weighted...

Axial FLAIR MR images (A, B) demonstrate multiple areas of abnormal high signal in the basal ganglia as well as cortex and subcortical white...

Axial T2-weighted MR image (A) demonstrates an irregularly shaped low signal lesion involving the left orbital apex (arrow).

Axial FLAIR MRI demonstrates abnormal high signal involving the anterior pons (arrow); following gadolinium administration, the lesion was nonenhancing (not shown). Brainstem lesions are typical of Behçet's disease, caused primarily by vasculitis and in some cases demyelinating...

Case I

Coronal (A) and axial (B) T1-weighted images postgadolinium with fat suppression demonstrate a homogeneously enhancing well-circumscribed mass centered in the left Meckel's cave (

Case II

Axial (A, B) and sagittal (C) T1-weighted images postgadolinium with fat suppression demonstrate a homogeneously enhancing mass involving the hypothalamus and the pituitary stalk (

Case III

Axial FLAIR images (A–E) demonstrate abnormal high signal and slight expansion in the midbrain, dorsal pons, and pineal region (

Case IV

Axial T2-weighted images (A–D) demonstrate numerous areas of abnormal hyperintensity involving the corpus callosum, left internal capsule and globus...

Sagittal T1-weighted image (A) demonstrates enlargement of the pituitary stalk (arrow) and absence of the posterior pituitary intrinsic T1 hyperintensity (arrowhead).

Sagittal and coronal T1-weighted images postgadolinium (B, C) demonstrate enhancement of the pituitary stalk and infundibulum (

Time-of-flight (TOF) MR angiography (MRA) (A, B) reveals narrowing within the left M1 segment that is likely secondary to atherosclerosis (

Axial noncontrast CT (A) demonstrates abnormal hypodensity involving the left anterior putamen and anterior limb of internal capsule with ex-vacuo dilatation of the adjacent frontal horn of the...

Axial T2-weighted MR images (A, B) demonstrate multiple patchy areas of abnormal high signal in the...

Axial noncontrast CT (A) demonstrates a large hyperdense intraparenchymal hematoma surrounded by hypodense vasogenic edema in the right parietal lobe.

Axial T2-weighted MRI (

Noncontrast CT of the head (A) demonstrates increased density in the superior sagittal sinus, suggestive of thrombosis (arrow), and small linear...

Axial T2-weighted MR image (A) reveals symmetric poorly circumscribed abnormal high signal in the middle cerebellar peduncles bilaterally (arrowheads).

Sagittal T1-weighted MR image (B) demonstrates pontine atrophy and enlarged cerebellar fissures as a result of cerebellar atrophy (

Axial noncontrast CT (A) demonstrates symmetric bilateral severe atrophy involving the caudate nuclei, putamen, and globus pallidi bilaterally with consequent enlargement of the frontal horns of...

Axial T1-weighted images postgadolinium with fat suppression (A–C) demonstrate diffuse smooth linear enhancement along the left facial nerve, involving the second and third segments (genu,...

Sagittal T2-weighted MR image of the lumbar spine (A) demonstrates poorly defined areas of abnormal high signal in the conus medullaris and mild cord expansion (

Sagittal T2-weighted MR image (A) demonstrates abnormal high signal in the cervical cord extending from C1 to T1 with associated cord expansion (arrows)....

Axial T2-weighted (A) and coronal FLAIR (B) images demonstrate abnormal areas of high signal involving predominantly...

Coronal FLAIR MRI (A) demonstrates multiple areas of abnormal high signal in the supratentorial white matter bilaterally. The lesions are ovoid in...

Axial FLAIR (A) demonstrates focal area of abnormal high signal involving the gray and white matter in the left frontal lobe. There is also a small area of abnormal high signal in the...

Axial (A), sagittal (B), and coronal (C, D) short tau inversion recov...

Sagittal CT demonstrates the tip of the dens below the anterior arch of C2 (arrow), indicating anterior dislocation.

Axial CT demonstrates fracture line along the C2 facet (arrow).

Sagittal T2-weighted MRI demonstrates compression fracture of C7 (*) and high signal within the spinous processes of C6-C7 (arrows) and to lesser degree C5-C6. This is suggestive of interspinous ligament injury. Note the pad under the patient's neck to maintain neck alignment during the scanning...

Axial noncontrast CT (A) demonstrates a high-density epidural collection in the cervical spine (*), which is consistent with acute hemorrhage. Also noted is mass effect on the spinal cord (

Sagittal T1-weighted MRI demonstrates a hyperflexion fracture with retropulsion of the posterior wall in the canal at C5 and C6 (arrow). There is also a large retropharyngeal hematoma (*). The distance from the posterior wall of the...

Axial CT demonstrates four fracture lines (arrows) separating C1 in four parts. Jefferson fracture is usually caused by axial impact to the head such as diving in shallow water.

Coronal CT reconstruction demonstrates abnormal asymmetry between the dens and the lateral masses of C1 indicating transverse ligament rupture.

Sagittal CT demonstrates disruption of the main reference cervical lines. 1: Anterior vertebral body line; 2: Posterior vertebral body line; 3: Spinolaminar line.

Sagittal T1-weighted MRI (A) demonstrates wedge-shaped T6 vertebral body (arrow). Sagittal postcontrast T1-weighted MRI (B) depicts tumor extension into the epidural space and the involvement of the posterior arch (*), which are highly suggestive of metastatic or primary bone...

Axial T2-weighted MRI (A) and T1-weighted MRI (B) demonstrate symmetric high T2 and low T1 signal involving the sacral alae longitudinally (arrows).

Sagittal T2-weighted MRI (A) and axial noncontrast T1-weighted MRI (B) demonstrate subdural collection in the lumbosacral region (**). Note that the epidural fat is compressed but not involved (

Sagittal CT (A) demonstrates fracture line separating the antero-inferior corner of C6 (arrow). Sagittal T2-weighted MRI (B) displays cord injury (