ABSTRACT
We report the MR study of a case of high-grade glioma that mimics leptomeningeal carcinomatosis. Superficial gliomas should thus be included in the differential diagnosis of isolated meningeal enhancement.
Subject(s)
Glioma/diagnosis , Magnetic Resonance Imaging , Meningeal Neoplasms/diagnosis , Adult , Biopsy , Contrast Media , Drug Combinations , Female , Gadolinium DTPA , Glioma/pathology , Humans , Meglumine , Meningeal Neoplasms/pathology , Meninges/pathology , Organometallic Compounds , Pentetic Acid/analogs & derivativesABSTRACT
A case of clinically unsuspected pneumoparotitis diagnosed by CT is presented. The CT demonstration of air collections in the parotid gland and in the parotid ducts until their buccal orifices, as well as in the adjacent high-pressure buccal air pockets, determines the diagnosis.
Subject(s)
Air , Parotitis/diagnostic imaging , Tomography, X-Ray Computed , Child , Diagnosis, Differential , Humans , MaleABSTRACT
In this study performed on 5 healthy volunteers the authors used oblique axial, coronal and sagittal MRI sections suitable to be anatomical configuration of the acoustic-facial bundle and were able to individualize the nerves forming this bundle throughout their course, with the sole exception of the intermediate nerve (VII2). They also analysed the relations of these nerves between themselves and with the other elements of the cerebellopontine angle. In addition, a proton-density sequence (SE, 6,000/30 ms) made it possible to differentiate in vivo between the grey matter and the white matter sufficiently to individualize the principal nuclei and tracts of the brain stem, and in particular the main vestibulo-cochlear central pathways.
Subject(s)
Brain Stem/anatomy & histology , Facial Nerve/anatomy & histology , Magnetic Resonance Imaging/methods , Vestibulocochlear Nerve/anatomy & histology , Adult , Cerebellopontine Angle/anatomy & histology , Cerebellum/anatomy & histology , Cerebral Ventricles/anatomy & histology , Cochlea/innervation , Cochlear Nerve/anatomy & histology , Ear, Inner/innervation , Ear, Middle/innervation , Humans , Nerve Fibers, Myelinated/ultrastructure , Neural Pathways/anatomy & histology , Petrous Bone/innervation , Semicircular Canals/innervation , Vestibular Nerve/anatomy & histology , Vestibular Nuclei/anatomy & histologyABSTRACT
Iron deposits demonstrate characteristically shortened T2 relaxation times. Several previously published studies reported poor correlation between the in vivo hepatic 1/T2 measurements made by means of midfield magnetic resonance (MR) units and the hepatic iron content of iron-overloaded patients. In this study, the authors assessed the use of in vivo 1/T2 measurements obtained by means of MR imaging at 0.5 T using short echo times (13.4 and 30 msec) and single-echo-sequences as well as computed tomographic (CT) attenuation as a measure of liver iron concentration in 10 severely iron-overloaded patients with beta-thalassemia major. The iron concentrations in surgical wedge biopsy samples of the liver, which varied between 3 and 9 mg/g of wet weight (normal, less than or equal to 0.5 mg/g), correlated well (r = .93, P less than or equal to .0001) with the preoperative in vivo hepatic 1/T2 measurements. The CT attenuation did not correlate with liver iron concentration. Quantitative MR imaging is a readily available noninvasive method for the assessment of hepatic iron concentration in iron-overloaded patients, reducing the need for needle biopsies of the liver.
Subject(s)
Iron/analysis , Liver/pathology , Magnetic Resonance Imaging , Adolescent , Adult , Biopsy , Child , Humans , Liver/chemistry , Spectrometry, X-Ray Emission , Thalassemia/metabolism , Thalassemia/pathology , Thalassemia/therapy , Tomography, X-Ray Computed , Transfusion ReactionABSTRACT
The clinical and magnetic resonance (MR) imaging findings in 20 patients with MR evidence of occult cerebrovascular malformations (OCVMs) were retrospectively analyzed. Of 27 lesions followed up throughout a mean period of 18 months, eight showed obvious evolution on MR images (four cases of regression and four cases of new bleeding). Three new independent lesions were disclosed. Clinical evolution was discordant with MR findings in five patients. In the other patients, topography of the lesion, mass effect, and location of the hemorrhage could explain clinical data. The dynamic nature of OCVMs must be considered in decisions on therapeutic management.
