scholarly journals Dynamic and three-dimensional transcranial sonography studies of an asymptomatic, cerebral convexity arachnoid cyst

1999 ◽  
Vol 7 (6) ◽  
pp. E12
Author(s):  
Felix Schlachetzki ◽  
Thilo Hölscher ◽  
O.W. Ullrich ◽  
M.D. Sabine Kübber ◽  
Wendelin Blersch ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Arachnoid Cyst ◽  
Three Dimensional ◽  
Imaging Study ◽  
Transcranial Sonography ◽  
Dynamic Imaging ◽  
Noninvasive Methods ◽  
Benign Condition ◽  
Csf Circulation

Dynamic and three-dimensional transcranial sonography (dTCS and 3D-TCCS) examinations are complementary, noninvasive methods used in the assessment and follow up of patients with cerebrospinal fluid (CSF) circulation disorders. A 16-year-old female patient who presented with a space-occupying, cerebral convexity arachnoid cyst and recurrent tension-type headache underwent examination for raised intracranial pressure (ICP) by using a standard color-coded duplex sonography system attached to a personal computer–based system for 3D data acquisition. Conventional TCS identified the outer arachnoid membrane of the cyst, which undulated freely after short rotation of the head (“headshake maneuver”). The undulation was documented as a QuickTime movie that is included with this article. A 3D dataset was acquired and, by using a multiplanar reformatting reconstruction algorithm, the authors obtained images with excellent resolution that corresponded to an initial magnetic resonance (MR) imaging study. No differences on dTCS and 3D-TCS were detectable at follow up 9 months later, indicating normal ICP and a stable, benign condition. The use of 3D-TCCS and dTCS ultrasonography may complement other diagnostic procedures such as MR imaging and, thus, can improve management and therapeutic strategies for patients with CSF circulation disorders. In this report the authors present evidence of the excellent fine resolution and exact reproducibility of reconstructed ultrasound image planes derived from 3D datasets and the additional biomedical information from dynamic imaging.

A sacral arachnoid cyst causing holocord syringomyelia

2011 ◽  
Vol 8 (3) ◽  
pp. 299-302 ◽  
Author(s):  
Sumit Thakar ◽  
Narayanam Anantha Sai Kiran ◽  
Alangar S. Hegde
Keyword(s):  
Mr Imaging ◽  
Arachnoid Cyst ◽  
Complete Resolution ◽  
Spastic Paraparesis ◽  
Arachnoid Cysts ◽  
Sensory Loss ◽  
Low Back ◽  
Filum Terminale ◽  
Sensory Deficits

Spinal extradural arachnoid cysts (ACs) have an infrequent predilection for the sacrum. As with their counterparts in other regions of the spine, cysts in this location are mostly asymptomatic. Common presentations in symptomatic cases include pain in the low back or perineum, radiculopathy, and sphincteric dysfunction. The authors report a hitherto undescribed presentation in which the predominant symptoms are those related to an associated holocord syrinx. This 15-year-old boy presented with fluctuating, spastic paraparesis and a dissociated sensory loss in the trunk. Admission MR imaging of the spine showed an extradural AC from S-2 to S-4 and a holocord, nonenhancing syrinx. The patient underwent S-2 laminectomy, fenestration of the cyst, and partial excision of its wall. Intradural exploration revealed a normal-looking filum terminale and the absence of any dural communication with the cyst. At a follow-up visit 6 months after surgery, his motor and sensory deficits had resolved. Follow-up MR imaging showed complete resolution of the syrinx in the absence of the sacral AC. This is the first report of a sacral extradural AC causing holocord syringomyelia. Because conventional theories of syrinx formation were not helpful in elucidating this case, a hypothesis is postulated to explain the clinicoradiological oddity.

Accelerated spondylotic changes adjacent to the fused segment following central cervical corpectomy: magnetic resonance imaging study evidence

2004 ◽  
Vol 100 (1) ◽  
pp. 2-6 ◽  
Author(s):  
Vaijayantee Kulkarni ◽  
Vedantam Rajshekhar ◽  
Lakshminarayan Raghuram
Keyword(s):  
Magnetic Resonance ◽  
Mr Imaging ◽  
Imaging Study ◽  
Degenerative Changes ◽  
Adjacent Segment ◽  
Mr Images ◽  
Short Term ◽  
Content Type ◽  
Fine Print

Object. The authors studied whether cervical spine motion segments adjacent to a fused segment exhibit accelerated degenerative changes on short-term follow-up magnetic resonance (MR) imaging. Methods. Preoperative and short-term follow-up (mean duration 17.5 months, range 10–48 months) cervical MR images obtained in 44 patients who had undergone one- or two-level corpectomy for cervical spondylotic myelopathy were evaluated qualitatively and quantitatively. The motion segment adjacent to the fused segment and a segment remote from the fused segment were evaluated for indentation of the thecal sac, disc height, and sagittal functional diameter of the spinal canal on midsagittal T2-weighted MR images. Thecal sac indentations were classifed as mild, moderate, and severe. New indentations of the thecal sac of varying severity (mild in 17 patients [38.6%], moderate in 10 [22.7%], and severe in six [13.6%]) had developed at the adjacent segments in 33 (75%) of 44 patients. The degenerative changes were seen at the superior level in 11 patients, inferior level in 10 patients, and at both levels in 12 patients and resulted from both anterior and posterior element degeneration in the majority (23 [69.6%]) of patients. The remote segments showed mild thecal sac indentations in seven patients and moderate indentations in two patients (nine [20.5%] of 44). Compared with the changes at the remote segment, the canal size was significantly decreased at the superior adjacent segment by 0.9 mm (p = 0.007). No patient sustained a new neurological deficit due to adjacent-segment changes. Conclusions. On short-term follow-up MR imaging, levels adjacent to the fused segment exhibited more pronounced degenerative changes (compared with remote levels) in 75% of patients who had undergone one- or two-level central corpectomy.

scholarly journals Error analysis for a free-hand three-dimensional ultrasound system for neuronavigation

1999 ◽  
Vol 6 (3) ◽  
pp. E7 ◽  
Author(s):  
Alexander Hartov ◽  
Symma D. Eisner ◽  
W. Roberts ◽  
Keith D. Paulsen ◽  
Leah A. Platenik ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Three Dimensional ◽  
Ultrasound Image ◽  
Imaging Study ◽  
Ct Scanning ◽  
Preoperative Imaging ◽  
Ultrasound Images ◽  
Imaging Data ◽  
Extensive Evaluation ◽  
Ultrasound System

Image-guided neurosurgery that is directed by a preoperative imaging study, such as magnetic resonance (MR) imaging or computerized tomography (CT) scanning, can be very accurate provided no significant changes occur during surgery. A variety of factors known to affect brain tissue movement are not reflected in the preoperative images used for guidance. To update the information on which neuronavigation is based, the authors propose the use of three-dimensional (3-D) ultrasound images in conjunction with a finite-element computational model of the deformation of the brain. The 3-D ultrasound system will provide real-time information on the displacement of deep structures to guide the mathematical model. This paper has two goals: first, to present an outline of steps necessary to compute the location of a feature appearing in an ultrasound image in an arbitrary coordinate system; and second, to present an extensive evaluation of this system's accuracy. The authors have found that by using a stylus rigidly coupled to the 3-D tracker's sensor, they were able to locate a point with an overall error of 1.36 ± 1.67 mm (based on 39 points). When coupling the tracker to an ultrasound scanhead, they found that they could locate features appearing on ultrasound images with an error of 2.96 ± 1.85 mm (total 58 features). They also found that when registering a skull phantom to coordinates that were defined by MR imaging or CT scanning, they could do so with an error of 0.86 ± 0.61 mm (based on 20 coordinates). Based on their previous finding of brain shifts on the order of 1 cm during surgery, the accuracy of their system warrants its use in updating neuronavigation imaging data.

Transient postictal magnetic resonance imaging abnormality of the corpus callosum in a patient with epilepsy

2002 ◽  
Vol 97 (3) ◽  
pp. 714-717 ◽  
Author(s):  
Aaron A. Cohen-Gadol ◽  
Jeffrey W. Britton ◽  
Clifford R. Jack ◽  
Jonathan A. Friedman ◽  
W. Richard Marsh
Keyword(s):  
Magnetic Resonance ◽  
Corpus Callosum ◽  
Mr Imaging ◽  
Imaging Study ◽  
Hyperintense Lesion ◽  
Content Type ◽  
History Of ◽  
Antiepileptic Medications ◽  
High Index Of Suspicion

✓ Transient neuroimaging abnormalities associated with seizure activity have received little attention in the literature. The authors report a focal magnetic resonance (MR) imaging abnormality of the corpus callosum in a patient following a secondary generalized seizure. A 27-year-old right-handed man presented with a history of medically refractory partial seizures since the age of 1 year. The results of an MR imaging study obtained 4 months prior to the patient undergoing video-electroencephalography monitoring were unremarkable. After the patient discontinued all antiepileptic medications, a secondary generalized seizure of right temporal origin was recorded. Five days later, repeated MR imaging revealed a nonenhancing 14 × 11—mm ovoid hyperintense lesion in the splenium of corpus callosum. The patient was asymptomatic, and his neurological and neurocognitive examinations remained unremarkable. Follow-up MR imaging 5 weeks and 1 year later demonstrated near-complete resolution of the lesion. Benign and transient abnormalities in the splenium can occur as a periictal phenomenon. A high index of suspicion and follow-up imaging may prevent further unwarranted intervention.

scholarly journals Thoracoscopic treatment of a rare bilateral extralobar lung sequestration in a 3-years old girl

2021 ◽  
Vol 42 (2) ◽  
Author(s):  
Cosimo Bleve ◽  
Maria Luisa Conighi ◽  
Diego Biondini ◽  
Pier Luca Ceccarelli ◽  
Leonardo Giarraputo ◽  
...  
Keyword(s):  
Antenatal Diagnosis ◽  
Three Dimensional ◽  
Imaging Study ◽  
Thoracoscopic Resection ◽  
Bronchopulmonary Foregut Malformation ◽  
Postoperative Course ◽  
Foregut Malformation ◽  
Bridge Crossing ◽  
Intrathoracic Mass

Majority of sequestrations fall into two categories: Intra-Lobar (ILS) and Extra-Lobar (ELS). Rarely the abnormal lung could be attached to the gastrointestinal tract, Bronchopulmonary Foregut Malformation (BPFM). We described a case of a girl of 3-years-old with antenatal diagnosis of left intrathoracic mass of the inferior lobe. Postnatal Computed-Tomography (CT) revealed a bilateral ELS with an isthmic bridge crossing the vertebral spine. She follows a MRI follow-up at 18months/30months confirming the lesion. Before surgery, a three-dimensional-CT-angiography was performed to study the mass, its blood supply and to plan surgery. She underwent to thoracoscopic resection. Two aberrant blood vessels were dissected from the thoracic aorta and ligated. The postoperative course was uneventful. She was discharged after 3 days. The rarity of our case is due to the bilateral extension. An appropriate preoperatory imaging study is necessary for the success of surgery while thoracoscopy is particularly appropriate in surgical treatment.

scholarly journals Machine Learning of Three-dimensional Right Ventricular Motion Enables Outcome Prediction in Pulmonary Hypertension: A Cardiac MR Imaging Study

Radiology ◽  
2017 ◽  
Vol 283 (2) ◽  
pp. 381-390 ◽  
Author(s):  
Timothy J. W. Dawes ◽  
Antonio de Marvao ◽  
Wenzhe Shi ◽  
Tristan Fletcher ◽  
Geoffrey M. J. Watson ◽  
...  
Keyword(s):  
Machine Learning ◽  
Pulmonary Hypertension ◽  
Mr Imaging ◽  
Right Ventricular ◽  
Outcome Prediction ◽  
Three Dimensional ◽  
Imaging Study ◽  
Cardiac Mr ◽  
Ventricular Motion

Dynamic and three dimensional transcranial ultrasonography of an arachnoid cyst in the cerebral convexity

2001 ◽  
Vol 94 (4) ◽  
pp. 655-659 ◽  
Author(s):  
Felix Schlachetzki ◽  
Thilo Hoelscher ◽  
Odo-Winfried Ullrich ◽  
Berthold Schalke ◽  
Ulrich Bogdahn
Keyword(s):  
High Resolution ◽  
Arachnoid Cyst ◽  
Three Dimensional ◽  
Reconstruction Algorithm ◽  
Diagnostic Procedures ◽  
Data Sets ◽  
Content Type ◽  
Tension Type Headaches ◽  
Fine Print

✓ Structural imaging of the brain, such as cerebral computerized tomography (CT) and magnetic resonance (MR) imaging, is state-of-the-art. Dynamic transcranial (dTC) ultrasonography and three-dimensional (3D) transcranial color-coded duplex (TCC) ultrasonography are complementary, noninvasive procedures with the capacity for real-time imaging, which may aid in the temporary management of space-occupying lesions. A 16-year-old woman presented with recurrent tension-type headaches. A space-occupying arachnoid cyst in the cerebral convexity was demonstrated on MR images. The patient underwent an examination for raised intracranial pressure, which was performed using a standard color-coded duplex ultrasonography system attached to a personal computer—based system for 3D data acquisition. Transcranial ultrasonography was used to identify the outer arachnoid membrane of the cyst, which undulated freely in response to rotation of the patient's head (headshake maneuver). Three-dimensional data sets were acquired and, using a multiplanar reformatting reconstruction algorithm, the authors obtained high-resolution images that corresponded to the initial MR image and a follow-up cranial CT scan. No detectable differences were observed on dTC or 3D TC ultrasonograms obtained at follow-up examinations performed 9 and 28 months later. Three-dimensional TCC and dTC ultrasonography may complement conventional diagnostic procedures such as MR and CT imaging. This report represents evidence of the high resolution and good reproducibility of 3D TC methods. Ultrasonography is a mobile and inexpensive tool and may be used to improve management and therapeutic strategies for patients with space-occupying brain lesions in selected cases.

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