scholarly journals Teaching NeuroImages: All hemiparesis are not contralateral

Neurology ◽  
2020 ◽  
pp. 10.1212/WNL.0000000000010755
Author(s):  
Y. Muralidhar Reddy ◽  
Subhendu Parida ◽  
Jagarlapudi MK Murthy
Keyword(s):  
Corticospinal Tract ◽  
Complete Recovery ◽  
Left Hemiparesis ◽  
Motor Pathway ◽  
Acute Infarct ◽  
Posterior Fossa Malformations ◽  
Intravenous Alteplase ◽  
Extrapyramidal Motor ◽  
Mr Brain ◽  
Ipsilateral Hemiparesis

A 56-yr-old hypertensive male presented with left-sided weakness of 2-h duration. He made complete recovery from right hemiparesis due to left parietal infarct. Examination showed dysarthria and left hemiparesis (NIHSS 8/42). MR-brain showed both left parietal acute infarct and gliosis from old infarct (Figure-1). He was successfully thrombolysed with intravenous alteplase. Present stroke was diagnosed as ipsilateral hemiparesis, confirmed by DTI (Figure-2). Ipsilateral hemiparesis, mostly seen with posterior fossa malformations and remote infarctions, results from injury to uncrossed corticospinal tract (CST) in patients of remote brain injury or with no decussation of CST or injury to ipsilateral extrapyramidal motor pathway.

scholarly journals Changes in descending motor pathway connectivity after corticospinal tract lesion in macaque monkey

Brain ◽  
2012 ◽  
Vol 135 (7) ◽  
pp. 2277-2289 ◽  
Author(s):  
B. Zaaimi ◽  
S. A. Edgley ◽  
D. S. Soteropoulos ◽  
S. N. Baker
Keyword(s):  
Corticospinal Tract ◽  
Macaque Monkey ◽  
Motor Pathway

Hemiparesis caused by vertebral artery compression of the medulla oblongata

1985 ◽  
Vol 62 (3) ◽  
pp. 425-429 ◽  
Author(s):  
Phyo Kim ◽  
Buichi Ishijima ◽  
Hiroshi Takahashi ◽  
Hiroyuki Shimizu ◽  
Masayuki Yokochi
Keyword(s):  
Vertebral Artery ◽  
Medulla Oblongata ◽  
Corticospinal Tract ◽  
Left Vertebral Artery ◽  
Vascular Compression ◽  
Left Hemiparesis ◽  
Content Type ◽  
Topographical Anatomy ◽  
Vertebral Artery Compression ◽  
Fine Print

✓ The case is reported of a patient with progressive left hemiparesis due to vascular compression of the medulla oblongata. Metrizamide computerized tomography cisternography revealed that the left vertebral artery was compressing and distorting the left lateral surface of the medulla. Compression was surgically relieved and symptoms improved postoperatively. Neurological and symptomatic considerations are discussed in relation to the topographical anatomy of the lateral corticospinal tract.

Preliminary Report of a Comparative Study of Seminiferous Tubular Epithelium from Rats Flown on Cosmos 1887 and SL3

1988 ◽  
Vol 46 ◽  
pp. 276-277
Author(s):  
Walter J. Sapp ◽  
D.E. Philpott ◽  
C.S. Williams ◽  
K. Kato ◽  
J. Stevenson ◽  
...  
Keyword(s):  
Space Flight ◽  
Physiological Response ◽  
Preliminary Report ◽  
Complete Recovery ◽  
Environmental Constraints ◽  
Tubular Epithelium ◽  
Testicular Weight ◽  
Testicular Morphology ◽  
Normal Offspring ◽  
Rats And Mice

Space flight, with its unique environmental constraints such as immobilization, decreased and increased pressures, and radiation, is known to affect testicular morphology and spermatogenesis. Selye, summarized the manifestations of physiological response to nonspecific stress and he pointed out that atrophy of the gonads always occurred. Reports of data collected from two dogs flown in space for 22 days (Cosmos 110) indicate that there was an increase of 30 to 70% atypical spermatozoa when compared to ground based controls. Seventy-five days after the flight the abnormalities had decreased to the high normal value of 30% and mating of these dogs after this period produced normal offspring, suggesting complete recovery. Effects of immobilization and increased gravity were investigated by spinning rats and mice at 2x g for 8-9 weeks. A decrease in testicular weight was noted in spun animals when compared to controls. Immobilization has been show to cause arrest of spermatogenesis in Macaca meminstrins.

3-D optical transfer in excitation field synthesis microscopes

1995 ◽  
Vol 53 ◽  
pp. 64-65
Author(s):  
Vijay Krishnamurthi ◽  
Brent Bailey ◽  
Frederick Lanni
Keyword(s):  
Standing Wave ◽  
Spatial Information ◽  
3D Structure ◽  
Complete Recovery ◽  
Weighting Factor ◽  
Optical Transfer Function ◽  
Excitation Field ◽  
Optical Transfer ◽  
Set Up ◽  
Focus Plane

Excitation field synthesis (EFS) refers to the use of an interference optical system in a direct-imaging microscope to improve 3D resolution by axially-selective excitation of fluorescence within a specimen. The excitation field can be thought of as a weighting factor for the point-spread function (PSF) of the microscope, so that the optical transfer function (OTF) gets expanded by convolution with the Fourier transform of the field intensity. The simplest EFS system is the standing-wave fluorescence microscope, in which an axially-periodic excitation field is set up through the specimen by interference of a pair of collimated, coherent, s-polarized beams that enter the specimen from opposite sides at matching angles. In this case, spatial information about the object is recovered in the central OTF passband, plus two symmetric, axially-shifted sidebands. Gaps between these bands represent "lost" information about the 3D structure of the object. Because the sideband shift is equal to the spatial frequency of the standing-wave (SW) field, more complete recovery of information is possible by superposition of fields having different periods. When all of the fields have an antinode at a common plane (set to be coincident with the in-focus plane), the "synthesized" field is peaked in a narrow infocus zone.

Obstacles to Claiming Permanence and Injury-Relatedness for “Posttraumatic” Headache

2009 ◽  
Vol 14 (3) ◽  
pp. 3-6
Author(s):  
Robert J. Barth
Keyword(s):  
Complete Recovery ◽  
World Health ◽  
Related Factors ◽  
Posttraumatic Headache ◽  
Sixth Edition ◽  
Causative Relationship ◽  
Short Period ◽  
The One ◽  
Health Organization ◽  
Subjective Reports

Abstract “Posttraumatic” headaches claims are controversial because they are subjective reports often provided in the complex of litigation, and the underlying pathogenesis is not defined. This article reviews principles and scientific considerations in the AMAGuides to the Evaluation of Permanent Impairment (AMA Guides) that should be noted by evaluators who examine such cases. Some examples in the AMA Guides, Sixth Edition, may seem to imply that mild head trauma can cause permanent impairment due to headache. The author examines scientific findings that present obstacles to claiming that concussion or mild traumatic brain injury is a cause of permanent headache. The World Health Organization, for example, found a favorable prognosis for posttraumatic headache, and complete recovery over a short period of time was the norm. Other studies have highlighted the lack of a dose-response correlation between trauma and prolonged headache complaints, both in terms of the frequency and the severity of trauma. On the one hand, scientific studies have failed to support the hypothesis of a causative relationship between trauma and permanent or prolonged headaches; on the other hand, non–trauma-related factors are strongly associated with complaints of prolonged headache.

Sign in / Sign up

Export Citation Format

Share Document