151 research outputs found
Endoscopic Endonasal Surgery for Suprasellar Rathke's Cleft Cyst Mimicking a Dermoid Cyst
No full textEndoscopic Endonasal Surgery for Suprasellar Rathke's Cleft Cyst Mimicking a Dermoid Cyst
No full textThe differential diagnoses of cystic epithelial masses in the sellar and parasellar regions, when based on clinical findings, imaging, and even histopathological examination, can be challenging. Considerable evidence in the literature supports the existence of a common ectodermal origin of selected sellar and suprasellar cysts, which may account for the overlap of radiological features and pathological transitional states observed among these lesions. Here, we describe a case of suprasellar Rathke's cleft cyst (RCC) mimicking a dermoid cyst, which after successful removal by endoscopic endonasal surgery (EES) by an experienced team of neurosurgeons and otolaryngologists achieved a good clinical outcome. A 30-year-old male was referred with chief complaints of left-sided loss of vision and headache. Magnetic resonance imaging findings indicated possible diagnoses as RCC, craniopharyngioma, or dermoid cyst because the cyst partly contained fluid with a lipid signal. The cyst was resected en-bloc with EES, and the histopathological diagnosis was RCC. RCCs may contain lipid components within the cyst, presumed to be cholesterin crystals due to chronic inflammation. In preoperative imaging of suprasellar cystic lesions, the presence of lipid components in the cyst may not indicate dermoid cyst, and care should be taken to differentiate it from RCC or craniopharyngioma.journal articl
Letter from residents of Block 30 to Ramond Best, Director of Tule Lake Camp, February 24, 1944
No full textLetter from residents of Block 30 to Raymond Best, Director of Tule Lake Camp, requesting the release of Hiroyoshi Tsuda from the army stockades at Tule Lake Camp.The Willard Schmidt collection, documents some of the administrative duties of Willard Schmidt, the Chief of Internal Security for the War Relocation Authority and the Tule Lake incarceration/segregation camp. This collection contains administrative records and photos documenting the Tule Lake camp, the largest incarceration camp with a peak population of 18,789 and with the most turbulent history. In 1943, the camp was turned into a segregation center to house "disloyal" Japanese Americans relocated from other camps based on their answers to a confusing loyalty questionnaire. The camp endured martial law from November 1943- Jan 1944 after escalating protests and unrest. The hostile environment of the camp lead to many incarcerees renouncing their American citizenship upon the end of incarceration, a process which took 14 years to reverse if they did not wish to be deported to Japan
Ultraviolet light responses in photovoltaic properties of TiO₂ / conducting polymer heterostructure devices
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Tokiyoshi Umeda, Yuuki Hashimoto, Hiroyoshi Mizukami, Tomoki Shirakawa, Akihiko Fujii, and Katsumi Yoshino, Appl. Phys. Lett. 85, 3139 (2004) and may be found at https://doi.org/10.1063/1.1804234.Photovoltaic properties of heterostructure devices of titanium oxide (TiO2) and conducting polymer thin films have been studied. Normal photovoltaic properties were stably observed upon the visible light irradiation of the wavelength range corresponding to the absorption of a conducting polymer, and unique photovoltaic properties were also observed upon the ultraviolet (UV) light irradiation of the wavelength range corresponding to the absorption of TiO2. UV light irradiation caused marked increases in the short-circuit current at the visible-wavelength range and in the open-circuit voltage. These properties have been discussed by considering the enhancement of the built-in field which originates from the hole accumulation caused by the trap levels in the TiO2 layer or TiO2 ∕ conducting polymer interface. This work was partly supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology and from the Japan Society for the Promotion of Science
Semantic Network:A Brief Review of its Datasets
No full textSemantic networks are graphical representations, in terms of nodes and edges, of words and phrases from the linguistics vocabulary to form a meaning and relation between them to describe the intended target or object. It is part of the computer science field utilising Natural Language Processing, text mining, psychology, and sociology. The edges may describe the relation between the nodes as weak or strong, or one way or both ways, or if the node is stand alone. Semantic networks use datasets like ConceptNet and WordNet which uses English vocabulary like nouns, verbs, adjectives, adverbs to form common meanings and relations. Sometimes the linguistics vocabulary is not present or not clear e.g., examining a patient electronic medical records or physician’s handwritten notes will reveal several terminologies which are only specific to medical professionals in their field. Similarly, when the intended target is an opinion or a subjective state which may or may not be true and represent the author personal views, biases, or prejudices. Instances like these make it difficult to establish a meaningful relation for data analysis purposes. In that case, need arises to develop a database from the ground up for the semantic network to be established. This paper briefly discusses the major semantic network datasets which are open source and available for semantic analysis.</p
Classification of Irreducible (g, k)-Modules Associated to the Ideals of Minimal Nilpotent Orbits for Simple Lie Groups of Type A
No full textWe classify completely prime primitive ideals whose associated varieties are the closure of the minimal nilpotent coadjoint orbit for g = sl(n, C) and classify irreducible (g, k)modules, which have those ideals as annihilators. Moreover, we irreducibly decompose them as k-modules
Giant Tumefactive Perivascular Spaces with Obstructive Hydrocephalus: A Case Report
No full textThe perivascular space is a normal anatomical structure that forms around perforating arteries and is filled with cerebrospinal fluid. In rare cases, the perivascular space is enlarged and form multiocular cysts measuring 1.5 cm or larger, which are called giant tumefactive perivascular spaces. Seventy-four cases who harbored tumefactive perivascular spaces have been reported to date, and about half of them required CSF diversion. The treatment for multiocular cysts themselves has been reported as being unnecessary. Herein, we report a case of a giant tumefactive perivascular space that caused obstructive hydrocephalus. In the case of obstructive hydrocephalus due to giant tumefactive perivascular spaces, the surgical intervention for the hydrocephalus, such as third ventriculostomy or ventricle-peritoneal shunt, would be the therapeutic choice. Thus, it is crucial to understand the characteristic imaging findings of giant tumefactive perivascular spaces; the signal of the lesions is isointense to the cerebrospinal fluid on each MRI sequence with minimum perifocal edema
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