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Sinonasal Schwannoma in a Six-Year-Old: An Unusual Presentation

Case Reports in Clinical Medicine 2016年第2期5卷 50-56页

作者： Oyeleye Abayomi Oyelakin Adekunle Dainel michael chukuwugoziem nweke Clement Abu Okolo Department of Otorhinolaryngology University College Hospital Ibadan Nigeria Department of pathology University College Hospital Ibadan Nigeria

Schwannomas commonly occur in the head and neck region and extremities, but nasal schwannoma is extremely rare. It accounts for less than 4% of benign solitary schwannomas of the head and neck region. Few cases and very few case series have been reported till date. We report the case of a six-year-old female who presented with mouth breathing of two years with persistent and progressive right nasal obstruction of three months. There was recurrent watery ipsilateral nasal discharge, but no epistaxis, no otologic or throat symptoms, no headaches, facial pain, proptosis or visual loss, no facial hypoesthesia, fever or weight loss. She also had right sided epiphora. She had used topical steroid and decongestant without improvement. Ten months prior to presentation, she had right dacrocystorhinostomy. Examination revealed mucosa mass completely filling the right nasal cavity with an ipsilateral deviation of nasal septum—it was painless with no contact bleeds. Nasal patency was clinically absent bilaterally. Computed tomogram revealed expansile isodense soft tissue mass in the right nasal cavity with heterogeneous enhancement on contrast administration which measured 2.5 cm by 3.7 cm by 5.2 cm. She had an intranasal excision of the tumour and histology revealed Antoni A and B patterns, which is diagnostic of schwannoma. She was fully relieved of symptoms after surgery. Conclusion: Solitary nasal schwannoma is rare especially in childhood. There are various causes of epiphora;definitive investigation of the cause in the index case was not established before dacrocystorhinostomy. Thorough nasal evaluation of epiphora or related ocular symptoms should be sought before definitive procedures.

关键词： Schwannoma Dacrocystorhinostomy Nasolacrimal Duct Antoni A and B Patterns

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Spatial Analysis and Modelling of Wind Farm Site Suitability in Nasarawa State, North-Central Nigeria

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Journal of Geographic Information System 2021年第5期13卷 603-630页

作者： Chukwunonso Emmanuel Ozim Anita Odionyenfe nweke Salamatu Abraham Ekpo Olufemi Stephen Oladeinde Haruna Kuje Ayuba Udochukwu michael Mbanaso GIS Unit Enugu Electricity Distribution Company Enugu Enugu State Nigeria Federal Ministry of Mines and Steel Development Abuja FCT Nigeria Department of Environmental Management Faculty of Environmental Science Nasarawa State University Keffi Nigeria National Space Research and Development Agency Obasanjo Space Centre Abuja FCT Nigeria Department of Urban and Regional Planning Faculty of Environmental Science Nasarawa State University Keffi Nigeria

There has been an increasing global and local interest in developing renewable, clean, and cheap energy towards achieving Goal number 7 of the Sustainable Development Goals (SDG). However, decisions involving suitable and sustainable locations for renewable energy projects remain an important task. This study employed Geographic Information System (GIS) and Multi-Criteria Decision Analysis (MCDA) to spatially analyze and model wind farm site suitability in Nasarawa State. The aim is to integrate the environmental, social, and economic aspects of decision-making for identifying sustainable wind farm sites. The study distinguished between two sets of decision criteria: decision constraints and decision factors. The former defined the exclusion zones while the latter were standardized based on fuzzy logic to depict varying degrees of suitability across the State. The MCDA applied the weighted linear combination method, with relative weights generated through pairwise comparisons of the analytic hierarchy process to analyze three policy scenarios: equal weights, environmental/social priority, and economic priority scenario. A combination of resulting composite maps from the constraints and the factors gave the final suitability maps. The resulting suitability index (SI) for the respective policy scenario describes the degrees of suitability: Ideal locations were denoted by one (1) and the not suitable locations by zero (0), with values in-between depicting varying degrees of wind farm site suitability. Based on the SI, priority locations indicating areas with good prospects, in addition to the most suitable parcels of land, were identified and delineated. The composite decision constraint revealed that wind farm projects would not be viable in more than half (57.58%) of the State. Wind speed was the major constraint and accounted for the exclusion of 46.25%, with a mean fuzzy membership value of 0.2008 indicating low suitability across the State. Also, the average accep

关键词： GIS Multi-Criteria Spatial Analysis and Modelling Wind Energy Farm Site Suitability Nasarawa State Nigeria

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