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Parietal Lobe

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181. ACR–ASNR Practice Parameter for Brain PET/CT Imaging Dementia Res. 17 – 2015 - 2019

degeneration or injury: elevated CSF tau protein (both total and phosphorylated tau); decreased F-18 fluorodeoxyglucose (FDG) uptake on PET in a specific topographic pattern involving posterior cingulate/precuneus and temporoparietal cortex; and atrophy on structural magnetic resonance, again in a specific topographic pattern involving medial, basal, and lateral temporal lobes and medial and lateral parietal cortices [9]. Biomarkers of Aß amyloid are indicative of initiating upstream events that may

2019 American Society of Neuroradiology

182. Movement Disorder and Neurodegenerative Diseases.

restriction in gray matter structures. This includes the cortex (particularly throughout the frontal, temporal, and parietal lobes—though often asymmetric—with occipital and cerebellar involvement in less common variants of sporadic CJD, the Heidenhain, and Brownell-Oppenheimer variants, respectively), the basal ganglia (60%, predominantly the anterior caudate and putamen), and the thalami (13%; including the posterior thalamus [pulvinar sign] or the posteromedial thalamus [hockey stick sign]) [6-8,10-15 (...) of these findings remain unclear. ACR Appropriateness Criteria ® 9 Movement Disorders and Neurodegenerative Diseases In patients with CBD, MRI shows asymmetric atrophy of the frontal and parietal lobes, typically contralateral to the more affected side, as well as the striatum [42,57-60]. Faint T2/FLAIR hyperintensity can also be seen in the subcortical white matter in the atrophic regions, likely related to neuronal loss and gliosis [42,57,59,60]. In patients with PSP, MRI generally shows midbrain atrophy

2019 American College of Radiology

183. Dementia

) elevated CSF tau, total tau, and phosphorylated tau; 2) decreased fluorine-18-2-fluoro-2-deoxy-D-glucose (FDG) uptake on PET in temporoparietal cortex; and 3) disproportionate atrophy on structural MRI in medial, basal, and lateral temporal lobe and medial parietal cortex. In persons who meet the core clinical criteria for probable AD dementia, biomarker evidence may increase the certainty that the basis of the clinical dementia syndrome is the AD pathophysiological process. The recommendations (...) on the frontal cortex in early FTD [46]. MR spectroscopy could be a helpful secondary test in patients who have clinical findings of FTD, but it is not a first-line imaging test. MRI Functional (fMRI) Head Brain activation has been shown to be significantly decreased in FTD in the frontal and parietal lobes compared with AD [47]. Resting state fMRI demonstrates alterations in structural and functional connectivity in presymptomatic FTD [48]. However, fMRI remains in the realm of research

2019 American College of Radiology

186. Guidelines on autopsy practice: Fetal autopsy (2nd trimester fetal loss and termination of pregnancy for congenital anomaly)

and genitalia · T- or Y-shaped skin incision on body · Central nervous system (CNS) examination: median posterior or transverse posterior parietal scalp incision observation of maturity to assist gestational assessment consider removal under water if suspected CNS malformation (including ventriculomegaly), examination of posterior fossa structures by posterior approach. Consider referring the whole central nervous system for neuropathological examination in appropriate cases. This may include sampling (...) ) will usually produce sufficient fixation to allow adequate sectioning and block sampling to allow the brain to be returned to the body before release for funeral. If there is doubt consult the local neuropathology team. [Level of evidence: GPP] 11 Histological examination Recommended blocks required at full autopsy: 9 · thymus · heart (septum and free walls) · lungs (right and left each lobe) · liver (both major lobes) · pancreas · spleen · adrenal glands CEff 150617 9 FINAL v1 · kidneys · muscle

2017 Royal College of Pathologists

187. Guidelines on autopsy practice: Third trimester antepartum and intrapartum stillbirth

at full autopsy: 8 CEff 150617 9 V1 Draft · thymus · heart (septum and free walls) · lungs (right and left each lobe) · liver (both major lobes) · pancreas · spleen · adrenal glands · kidneys · muscle and diaphragm · stomach, small and large bowels · larynx/trachea and thyroid · bone: rib including growth plate in stillbirth; long bone (including growth plate), vertebral body and skull mandatory for suspected skeletal dysplasia · brain: if preservation allows include cerebral cortex (...) and periventricular white matter (frontal, parietal, temporal and occipital), deep grey matter (caudate, striatum, thalamus), hippocampus, midbrain (inferior colliculi), pons, medulla (inferior olives), cerebellum with dentate nucleus. Sampling may by necessity be more restricted if there is advanced autolysis · other organ lesions as appropriate · placenta (at least three full-thickness blocks, plus focal lesions) · membrane roll · umbilical cord (at least two). [Level of evidence D.] A record of the samples

2017 Royal College of Pathologists

189. EANM-EAN recommendations for the use of brain 18F-Fluorodeoxyglucose Positron Emission Tomography (FDG-PET) in neurodegenerative cognitive impairment and dementia: Delphi consensus Full Text available with Trip Pro

parietal, AUC = 0.69, P = 0.045) . A trend was also observed for AD‐memory dominant cases, with AUC = 0.65 ( P = 0.062) for hypometabolism in bilateral inferior frontal, cuneus and inferior temporal, and right inferior parietal. The logopenic variant of PPA and typical AD dementia could be discriminated (AUC = 0.89) based on the right medial temporal and posterior cingulate gyri, the left inferior, middle and superior temporal lobes, and left supramarginal gyrus . Patients with posterior cortical (...) or in the infrequent DLB cases with a normal pre‐synaptic dopaminergic imaging. The inclusion of FDG‐PET in the new criteria for DLB as a supportive biomarker (a scan not showing hypometabolism in the occipital lobes does not exclude DLB) also contributed to the panellists’ decision. FDG‐PET to differentiate AD from FTLD (PICO 9) Critical outcomes were available in five of the examined papers . These papers found 80%–99% sensitivity range, 63%–98% specificity range, 87%–89.2% accuracy range , - , 0.91–0.97 AUC

2018 European Academy of Neurology

190. EANM guideline for ventilation/perfusion single-photon emission computed tomography (SPECT) for diagnosis of pulmonary embolism and beyond Full Text available with Trip Pro

[ ]. Pathophysiology When unperfused regions are ventilated, there is an increase in the dead space [ ]. This is one of the reasons for dyspnoea. Hypoxia, frequently present in major PE, is caused by several mechanisms. The emboli occluding pulmonary end arteries alter the local equilibrium and, therefore, can lead to haemorrhage, atelectasis, pleural effusion and pleuritic pain. The lung has no pain fibres; thus, pain in PE is a symptom consequence of the involvement of the parietal pleura. Moreover (...) for further research on this topic is underlined [ ]. Basic principles of PE diagnosis PE leads to loss of perfusion to the area corresponding to the volume supplied by the occluded end artery that may be a whole lung, a lobe, a lung segment or a subsegment. In general, the bronchial circulation maintains viability of the embolised volume, and ventilation remains largely intact. Accordingly, V/P SPECT exploits the unique pulmonary arterial segmental anatomy. Figure presents a segmental map, and a case

2019 European Association of Nuclear Medicine

193. Effects of drinking on late-life brain and cognition Full Text available with Trip Pro

for these actions is thought to include NMDA and GABA-A receptors. High doses of alcohol acutely reduce prefrontal and temporal lobe function, including planning, verbal fluency, memory and complex motor control including cerebellar function. The pattern of impairment has been compared with that seen in hippocampal damage. Excessive alcohol consumption can also lead to a number of conditions with psychiatric symptoms, including psychotic disorders and delirium. In this review we focus on structural brain (...) validation. Thresholds are likely to be different according to sex, comorbid conditions and genetic susceptibility. Effects on brain structure Brain atrophy in chronic alcoholism is well described. The frontal lobes are thought to be particularly vulnerable. Kril et al found frontal cortex reductions of 23% in uncomplicated alcoholism, replicating earlier findings. MRI studies have also reported widespread cortical atrophy, which may particularly affect the frontal lobes. Interestingly, longitudinal MRI

2018 Evidence-Based Mental Health

197. CRACKCast E101 – Stroke

by the anterior and posterior circulations. The anterior circulation originates from the carotid system and perfuses 80% of the brain, including the optic nerve, retina, and fronto-parietal and anterior-temporal lobes. The first branch off the internal carotid artery is the ophthalmic artery, which supplies the optic nerve and retina. As a result, the sudden onset of painless monocular blindness (amaurosis fugax) identifies the stroke as involving the anterior circulation (specifically the ipsilateral carotid (...) . The brainstem also contains the reticular activating system, which is responsible for mediating consciousness, and the emesis centers. Unlike those with anterior circulation strokes, patients with posterior circulation stroke can have loss of consciousness and frequently have nausea and vomiting. The posterior cerebral artery supplies portions of the parietal and occipital lobes, so vision and thought processing are impaired. One of the more curious facets of this syndrome is that the patient may be unaware

2017 CandiEM

199. Management of Brain Arteriovenous Malformations: A Scientific Statement for Healthcare Professionals From the American Heart Association/American Stroke Association Full Text available with Trip Pro

seizures. Multivariate logistic regression showed that clinical presentation with seizures correlated with a location in the temporal and frontal lobes and with a superficial topography. The strongest association (OR, 3.48; 95% CI, 1.77–6.85) was observed between seizures and bAVM location in the temporal lobe. A study of 302 consecutive patients with unruptured bAVMs added superficial venous drainage and presence of varices in the venous drainage as features associated with seizures ( P =0.005 and P (...) (anterior, middle, or posterior) cerebral divisions had lower risk of ICH (OR, 0.40; P <0.001). The authors noted positive associations with ICH for bAVM size (OR, 0.96; P <0.001), solely deep venous drainage (OR, 3.19; P <0.001), and associated aneurysm (OR, 2.72; P <0.001). Using DSA-based evaluation, Shankar et al reviewed 78 patients with nonhemorrhagic bAVMs presenting with (n=33) and without (n=45) seizures for distinguishing angioarchitectural features. They noted location (frontal, parietal

2017 American Heart Association

200. Management of brain arteriovenous malformations

patients with nonhemorrhagic bAVMs presenting with (n=33) and without (n=45) seizures for distinguishing angioarchitectural features. They noted location (frontal, parietal, temporal lobe; OR, 4.52; 95% CI, 0.95–21.47), venous outflow stenosis (OR, 6.71; 95% CI, 1.99–22.56), and long (>3-cm superficial course) pial draining vein (OR, 5.71; 95% CI, 1.32–24.56). The authors enumerated these values as a 3-point score with a receiver-operating characteristic curve of 0.841 (95% CI, 0.749–0.933 (...) -year risk of developing epilepsy after a first seizure was 58%. , One prospective observational study collected records of 101 consecutive patients with unruptured and ruptured bAVMs during a 10-year period and compared patients with and without seizures. Multivariate logistic regression showed that clinical presentation with seizures correlated with a location in the temporal and frontal lobes and with a superficial topography. The strongest association (OR, 3.48; 95% CI, 1.77–6.85) was observed

2017 American Academy of Neurology

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