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ON RULED SURFACES GENERATED BY SANNIA FRAME BASED ON ALTERNATIVE FRAME
Davut Canli,Suleyman S¸enyurt,Kebire Hilal Ayvacı 호남수학회 2024 호남수학학술지 Vol.46 No.1
The paper introduces a set of new ruled surfaces such that the base curve is taken to be the striction curve of N, C and W ruled surfaces from the alternative frame, and the generating line is taken to be one of the vectors of Sannia frame. The characterizations for each ruled surface such as fundamental forms, the Gaussian and mean curvature are also examined to provide the conditions for each surface to be developable or minimal
Thoracic Extraosseous Epidural Cavernous Hemangioma
Yaldiz, Can,Asil, Kiyasettin,Ceylan, Davut,Erdem, Sahin The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.57 No.1
Cavernous hemangiomas were first reported in 1929 by Globus and Doshay, and are defined as benign vascular structures developed between the neural tissues occurring in the central nervous system, consisting of a dilated vascular bed. Cavernous hemangiomas comprise nearly 5-12% of all spinal vascular malformations; however, existence in the epidural space without bone involvement is rare. Only 4% of all cavernous hemangiomas (0.22/1.000.000) are purely epidural cavernous hemangiomas. In this case report, we removed a hemorrhagic thoracic mass presenting with progressive neurological deficits in a 55-year-old male patient. We found this case to be appropriate for presentation due to the rare occurrence of this type of cavernous hemangioma.