Surgical Treatment of Tentorial Meningiomas ? Based on Our Classification Related to Venous Sinuses ?

We report our experience and long-term results in the surgical treatment of 27 tentorial meningiomas (TMs). These cases were operated on between 1980 to 2000.5 and represented 9.8% of all 275 surgically treated intracranial meningiomas in that period. Of the total 29 TMs (additional 2 non-surgically treated TMs), 25 were women and 4 were men ranging in age from 26 to 75 years (mean 55.2 years). According to the site of tumor attachment and the venous sinuses, these 29 TMs were divided into 6 subgroups: central (C; 3), anterolateral (AL; 3), posterolateral (PL; 6), free edge (FE; 6), anteromedial (AM; 3), and posteromedial (PM; 8). Various surgical approaches were selected on the tumor location and extension, however, these are divided into 2 approaches. One is anterior or posterior petrosal approach, selected in AL and FE cases and the other is combined occipital-suboccipital approach, selected in C, PL, AM, and PM cases. In 17 patients, total removal (Simpson Grade 1 : 8, II : 9) was achieved, subtotal removal (SG III) in 4, and partial removal (SG IV) in 6. Four patients had surgical complications. Gamma knife radiosurgery was performed in 4 residual and 3 recurrent meningiomas. In all these 7 meningiomas, tumor sizes have been well controlled. With a mean follow-up of 70 months (2 to 157 months), recurrences occurred in 5 patients (21.7%), which were subtotal and partial removal cases. Glasgow Outcome Scale scores were GR in 21 patients (77.8%), MD in 3 (11.1%), VS in 1 (3.7%), and D in 2 (7.4%)

Mixed alkali-ion transport and storage in atomic-disordered honeycomb layered NaKNi2TeO6

Honeycomb layered oxides constitute an emerging class of materials that show interesting physicochemical and electrochemical properties. However, the development of these materials is still limited. Here, we report the combined use of alkali atoms (Na and K) to produce a mixed-alkali honeycomb layered oxide material, namely, NaKNi2TeO6. Via transmission electron microscopy measurements, we reveal the local atomic structural disorders characterised by aperiodic stacking and incoherency in the alternating arrangement of Na and K atoms. We also investigate the possibility of mixed electrochemical transport and storage of Na+ and K+ ions in NaKNi2TeO6. In particular, we report an average discharge cell voltage of about 4 V and a specific capacity of around 80 mAh g–1 at low specific currents (i.e., < 10 mA g–1) when a NaKNi2TeO6-based positive electrode is combined with a room-temperature NaK liquid alloy negative electrode using an ionic liquid-based electrolyte solution. These results represent a step towards the use of tailored cathode active materials for “dendrite-free” electrochemical energy storage systems exploiting room-temperature liquid alkali metal alloy materials

The quality of information support analysis of business enterprises

В публікації розглядається основні характеристики інформаційного забезпечення діяльності підприємства.This publication is considered the main characteristics of the enterprise information supply

CENTRAL MUCOEPIDERMOID TUMOR OF THE MANDIBLE: Report of Case

An unusual mucoepidermoid tumor which occurred in the mandible is described. The tumor was successfully removed by hemimandibulectomy and neck dissection. The clinical, radiographic and histologic findings indicated the central origin of the tumor. The most probable source was assumed to be the inclusion of the retromolar mucous glands in the mandible during the course of development

Palladium-Catalyzed Synthesis of 4-Oxaspiro[2.4]heptanes via Central Attack of Oxygen Nucleophiles to π-Allylpalladium Intermediates

A palladium-catalyzed decarboxylative cyclopropanation of γ-methylidene-δ-valerolactones with aromatic aldehydes has been developed to give 4-oxaspiro[2.4]heptanes with high selectivity. The site of nucleophilic attack to a π-allylpalladium intermediate has been controlled with a sterically demanding phosphine ligand. The course of the reaction is highly dependent on ligands and solvents, and selective formation of methylenetetrahydropyrans has also been realized

Surgical Treatment of Tentorial Meningiomas ー Based on Our Classification Related to Venous Sinuses ー

We report our experience and long-term results in the surgical treatment of 27 tentorial meningiomas （TMs）. These cases were operated on between 1980 to 2000.5 and represented 9.8% of all 275 surgically treated intracranial meningiomas in that period. Of the total 29 TMs （additional 2 non-surgically treated TMs）, 25 were women and 4 were men ranging in age from 26 to 75 years （mean 55.2 years）. According to the site of tumor attachment and the venous sinuses, these 29 TMs were divided into 6 subgroups: central （C; 3）, anterolateral （AL; 3）, posterolateral （PL; 6）, free edge （FE; 6）, anteromedial （AM; 3）, and posteromedial （PM; 8）. Various surgical approaches were selected on the tumor location and extension, however, these are divided into 2 approaches. One is anterior or posterior petrosal approach, selected in AL and FE cases and the other is combined occipital-suboccipital approach, selected in C, PL, AM, and PM cases. In 17 patients, total removal （Simpson Grade 1 : 8, II : 9） was achieved, subtotal removal （SG III） in 4, and partial removal （SG IV） in 6. Four patients had surgical complications. Gamma knife radiosurgery was performed in 4 residual and 3 recurrent meningiomas. In all these 7 meningiomas, tumor sizes have been well controlled. With a mean follow-up of 70 months （2 to 157 months）, recurrences occurred in 5 patients （21.7%）, which were subtotal and partial removal cases. Glasgow Outcome Scale scores were GR in 21 patients （77.8%）, MD in 3 （11.1%）, VS in 1 （3.7%）, and D in 2 （7.4%）