AJNR. American journal of neuroradiology
-
AJNR Am J Neuroradiol · May 1998
MR features of developing periventricular white matter in preterm infants: evidence of glial cell migration.
MR imaging of the brain is increasingly used in the investigation of the newborn, but little information is available on the normal appearance of the developing brain. We scanned a series of newborn infants in an attempt to define the normal appearance of developing periventricular white matter and to assess how pathologic conditions may modify this appearance. ⋯ The uniform appearance of periventricular bands in a population of healthy infants and their relationship to the infants' maturity is consistent with the results of previous histologic studies. These studies demonstrate the presence of migrating glial cells within the periventricular white matter of infants beyond 20 weeks' gestation, when neuronal migration to the cortex is complete. We postulate that the bands seen on T2-weighted images represent groups of migrating glial cells, providing a further marker of cerebral maturation.
-
AJNR Am J Neuroradiol · Apr 1998
Patterns of lesion development in multiple sclerosis: longitudinal observations with T1-weighted spin-echo and magnetization transfer MR.
We evaluated the appearance of enhancing multiple sclerosis (MS) lesions on unenhanced T1-weighted MR images and the natural course of enhancing MS lesions on serial unenhanced T1-weighted and magnetization transfer (MT) MR images. ⋯ Most enhancing lesions appear slightly to significantly hypointense on unenhanced T1-weighted images. Although most hypointensities are reversible, only those lesions that fail to recover on unenhanced T1-weighted and MT images may have considerable irreversible structural changes.
-
AJNR Am J Neuroradiol · Apr 1998
Comparative StudyDiagnosis of brain death using two-phase spiral CT.
The purpose of this study was to determine the utility of spiral CT in the diagnosis of brain death. ⋯ Two-phase spiral CT can demonstrate the absence of intracerebral blood flow in brain death.
-
AJNR Am J Neuroradiol · Mar 1998
Case ReportsPrimary lingual abscess presenting as acute swelling of the tongue obstructing the upper airway: diagnosis with MR.
We report the sudden development of an inflammatory process thought to be of the floor of the mouth with subsequent involvement of the respiratory airway. MR imaging showed an enhancing posterior lingual lesion, consistent with an abscess. Immediate surgical drainage relieved the symptoms. MR imaging allowed accurate diagnosis, which was essential for surgical planning in a condition that was otherwise difficult to diagnose.
-
AJNR Am J Neuroradiol · Mar 1998
Case ReportsIsolated cortical venous thrombosis and ulcerative colitis.
Aseptic cortical venous thrombosis is rare without concomitant dural sinus thrombosis. Ulcerative colitis is associated with both dural sinus thrombosis and isolated cortical venous thrombosis. ⋯ An overlying thrombosed cortical vein was identified on spin-echo MR images and confirmed with angiography. Signal characteristics of thrombosed cortical veins are similar to those described in dural sinus thrombosis.