Journal of computer assisted tomography
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J Comput Assist Tomogr · Mar 1993
Case ReportsCT of superior mesenteric vein thrombosis complicating periappendiceal abscess.
Acute mesenteric vein thrombosis is a rare complication of appendicitis. In this report we describe the clinical association of these entities and emphasize how early diagnosis by CT can expedite treatment.
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This study evaluates the usefulness of MR angiography (MRA) in analyzing the individual collateral flow dynamics and anatomy of the circle of Willis in patients with high-grade extracranial carotid stenosis or occlusion. Selective MRA of the carotid or vertebrobasilar territory was performed by means of presaturation of up to three of the brain-supplying arteries at the level of the middle or lower neck (angled presaturation slabs). ⋯ Visibility of the posterior communicating artery at MRA predicted for pathological collateral flow via this vessel in all cases. We conclude that selective and nonselective MRA of the cerebral arteries as used here is the most powerful noninvasive method to demonstrate collateral circulation via the basal communicating arteries and to identify hemodynamically relevant anatomic variants of the circle of Willis.
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J Comput Assist Tomogr · Mar 1993
Klippel-Feil syndrome: CT and MR of acquired and congenital abnormalities of cervical spine and cord.
We reviewed MR and CT myelographic studies in patients with the Klippel-Feil syndrome (KFS) to determine the patterns of associated congenital and acquired abnormalities of the spine and spinal cord and to correlate these radiologic findings with the manner of clinical presentation. Twenty-four consecutive patients with radiologically definite KFS were evaluated by a cross-sectional imaging technique (CT or MR) over a 6 year period. Radiologic images were blindly interpreted by a panel of three experienced neuroradiologists and then correlated with clinical history. ⋯ Coexisting congenital defects of the spinal cord or brain were encountered in seven patients, six of whom were female, consisting of cervical cord dysraphism or diastematomyelia (n = 5) and Chiari I malformations (n = 2). In only eight patients (33%) had the diagnosis of KFS been suspected clinically prior to imaging by the presence of short neck, limited cervical mobility, or low occipital hairline. In the remaining 16 patients, mostly adolescents or adults being evaluated for cervical sensory or motor syndromes, the diagnosis of KFS was made radiologically at the time of the imaging referral.
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J Comput Assist Tomogr · Jan 1993
High resolution CT in respiratory bronchiolitis-associated interstitial lung disease.
High-resolution CT findings have been described for several diffuse lung diseases. Respiratory bronchiolitis-associated interstitial lung disease (RB-ILD) is an inflammatory lung disorder associated with cigarette smoking. ⋯ We describe high-resolution CT findings in five cases of biopsy-proven RB-ILD. The findings are variable and range from no detectable abnormality to atelectasis, ground-glass opacities, emphysema, and linear and reticular interstitial abnormalities.
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J Comput Assist Tomogr · Jan 1993
Comparative StudyIntracranial MRA: single volume vs. multiple thin slab 3D time-of-flight acquisition.
Single volume three-dimensional (3D) time-of-flight (TOF) MR angiography is the most commonly used noninvasive method for evaluating the intracranial vasculature. The sensitivity of this technique to signal loss from flow saturation limits its utility. A recently developed multislab 3D TOF technique, MOTSA, is less affected by flow saturation and would therefore be expected to yield improved vessel visualization. ⋯ There is improved visualization of selected intracranial vessels in normal volunteers with MOTSA as compared with single volume 3D TOF. These improvements are believed to be primarily a result of decreased sensitivity to flow saturation seen with the MOTSA technique. No difference in overall vessel visualization was noted for the two single volume 3D TOF techniques.