Multiple cerebral aneurysms and a dural arteriovenous fistula in a patient with polyarteritis nodosa. Case illustration.
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Adult↗
Biomedical subjects
Zoran Rumboldt
Publications and source records attributed to Zoran Rumboldt.
Unusual appearance of a cisternal hydatid cyst.
We herein describe a case of an isolated multilocular hydatid cyst occurring in the basilar cisterns, with nondependent levels of different signal intensities shown on MR images. Three portions were visualized on T1-weighted images: the hyperintense inferior aspect, the isointense central part, and the superior aspect of lower signal intensity. The inferior portion was hypointense on T2-weighted images. This unusual appearance was caused by layering of hydatid sand and may represent a characteristic feature of hydatid disease.
Brain Diseases↗
Hyperacute subarachnoid hemorrhage on T2-weighted MR images.
We describe a case of hyperacute subarachnoid and intraventricular hemorrhage from a ruptured aneurysm, which occurred while the patient was undergoing MR imaging. Compared with CSF, the blood in the subarachnoid space had slightly lower signal intensity on T2*-weighted gradient-echo images and increased signal intensity on T2-weighted spin-echo images. This finding differs from the generally accepted MR appearance of intracranial hemorrhage and should be recognized to ensure proper patient care.
Acute Disease↗
Bilateral congenital absence of the internal carotid artery.
Bilateral congenital absence of the internal carotid artery was incidentally found in an 11-year-old boy. Magnetic resonance imaging showed a normal-appearing brain that was entirely supplied by the vertebrobasilar system, and CT confirmed the absence of the bony carotid canals. Although most reported patients with agenesis of both internal carotid arteries presented with cerebrovascular lesions, this case demonstrates that this rare malformation may be asymptomatic.
Abnormalities, Multiple↗
Bilateral congenital absence of the internal carotid artery.
Bilateral congenital absence of the internal carotid artery was incidentally found in an 11-year-old boy. Magnetic resonance imaging showed a normal-appearing brain that was entirely supplied by the vertebrobasilar system, and CT confirmed the absence of the bony carotid canals. Although most reported patients with agenesis of both internal carotid arteries presented with cerebrovascular lesions, this case demonstrates that this rare malformation may be asymptomatic.
Basilar Artery↗
The palatovaginal canal: can it be identified on routine CT and MR imaging?
OBJECTIVE: The palatovaginal canal is a short bone tunnel that extends from the pterygopalatine fossa to the roof of the pharynx. The primary purpose of our work was to establish whether the palatovaginal canal can be identified on CT and MR imaging. The secondary goal was to establish the frequency of visualization and the appearance of this canal. MATERIALS AND METHODS: We retrospectively analyzed 150 consecutive direct coronal CT studies obtained for evaluation of the sinonasal cavities. Frequency, bilaterality, and appearance of the palatovaginal canals were recorded. The frequency of the vidian canals was recorded for comparison. We also analyzed 20 MR imaging studies of that area to assess visualization of the palatovaginal canals and their contents. A dry skull specimen was examined using CT, and the images were correlated with those obtained in vivo. RESULTS: The palatovaginal canal could be identified on CT on at least one side in 88 (58.7%) of 150 patients. Unilateral complete canals were found in 14 patients (9.3%), and unilateral semicanals were evident in 17 (11.3%). Bilateral complete canals were seen in 24 patients (16%), and bilateral semicanals were found in 11 (7.3%). In 22 patients (14.7%), one complete canal and one semicanal were detected. Fifty-five percent of the visualized canals were completely formed. The palatovaginal canal and its internal tubular structure, presumably corresponding to the pterygovaginal artery, were depicted on 40% of the MR imaging studies. The position and configuration of this canal as seen on CT of the dry skull specimen correlated well with the imaging findings. CONCLUSION: The palatovaginal canals are commonly depicted on CT and MR imaging.
Adolescent↗
Indolent intracranial mucormycosis: case report.
We present a patient with isolated intracranial mucormycosis that remained indolent for several months. The mucormycosis formed a mass in the prepontine cistern, probably spreading from the sphenoid sinus. We propose that at least some cases of what is considered isolated CNS mucormycosis develop from such unrecognized indolent infections. Mucormycosis may present as a mass in the basilar cisterns, especially in immunocompromised patients.
Adolescent↗
[Spiral CT angiography in practice].
Incidence of vascular diseases and development of new radiologic techniques in the last three decades has given strong impuls for introduction of non-invasive vascular diagnostic methods. Thanks to the introduction of Doppler ultrasound, new types of computed tomography (CT) and magnetic resonance (MR) scanners, non-invasive vascular diagnostic methods are replacing conventional invasive (catheter) angiographic methods. Computed tomographic angiography (CTA) is a noninvasive vascular diagnostic method based on continuous scanning with CT scanner during intravenous application of contrast material. Performing of CTA is possible after introduction of spiral CT technique whose characteristics are short imaging time and volumetric data acquisition. The main goal of this article, based on our experiences, is to review the role of CTA, performed on single-slice CT scanner, in managment of patients with vascular pathology.
Angiography↗