The present study reported a nearly asymptomatic case of intracranial capillary hemangioma (ICHs), which are rare benign vascular tumors or tumor-like lesions. A 33-year-old female came to the hospital with a complaint of a slight but recurring morning headache concentrated in the left posterior occipital area. These headaches spontaneously resolved without any treatment. Computed tomography and magnetic resonance imaging revealed a mass inside the left occipital lobe. The patient refused to undergo conservative observation at home and insisted on radical therapy. Prior to surgery, an atypical meningioma or astrocytoma was suspected. A navigation-guided brain-mass resection was performed under general anesthesia and a solid mass closely associated with the tentorium cerebelli was completely resected. Histopathological analysis confirmed diagnosis of an ICH. The patient recovered well and experienced no major neurological defects, apart from an issue with the right visual field. The present study also conducted a retrospective literature review of papers published in English describing cases of intracranial capillary hemangiomas. A PubMed search identified 19 articles comprising 29 cases. The clinical symptoms of ICH are diverse and all reported cases in the literature were symptomatic. Previous studies demonstrated that diagnoses of intracranial capillary hemangioma are usually made during surgical resection by histopathological examination. Treatment for ICH remains empirical and surgery is the most common method of treatment. Patient prognosis is generally good-the majority of patients achieve long-term, event- and progression-free survival.
Shape memory materials have gained considerable attention thanks to their ability to change physical properties when subjected to external stimuli such as temperature, pH, humidity, electromagnetic fields, etc. These materials are increasingly used for a large number of biomedical applications. For applications inside the human body, contactless control can be achieved by the addition of electric and/or magnetic particles that can react to electromagnetic fields, thus leading to a composite biomaterial. The difficulty of developing accurate numerical models for smart materials results from their multiscale nature and from the multiphysics coupling of involved phenomena. This coupling involves electromagnetic, thermal and mechanical problems. This paper contributes to the multiphysics modeling of a shape memory polymer material used as a medical stent. The stent is excited by electromagnetic fields produced by a coil which can be wrapped around a failing organ. In this paper we develop large deformation formulations for the coupled electro-thermo-mechanical problem using the electric potential to solve the electric problem. The formulations are then discretized and solved using the finite element method. Results are validated by comparison with results in the literature.The increase of life expectancy creates a need to maintain the functions of 2 aging organs to allow greater independence for the elderly. Biomaterial implants 3 have the potential to fulfill some of these functions. The total number of im-4 plants in the world exceeds four hundred million per year and grows every year 5 [1]. Biomaterials are also increasingly used for a large number of biomedical ap-6 plications such as the prevention and cure of coronary heart disease and stroke, 7 as well as ophthalmological applications, biosensors and drug delivery systems 8 [2, 3]. They have the potential to contribute to the reduction of the cost of 9 health and the improvment of the life conditions. 10 Among biomaterials, shape memory materials have gained considerable at-11 tention in the biomedical community thanks to their ability to change physical 12 properties (morphing, structural rigidity, refractive index, etc.) when subjected 13to external stimuli such as temperature, pH, humidity, electromagnetic fields, 14 etc. This special behavior results from the the shape memory effect observed 15 in shape memory materials [4]. They are used in minimally invasive surgery as 16 embolic devices to treat aneurysm [5, 6] and as vascular stents [7, 8, 9]. Fig-17 ure 1 illustrate the deployment of a stent in a blood vessel. They can also be 18 used as portable sensors to monitor heart and respiratory rates and in con-19 trolled drug delivery systems thus allowing to reduce the side effects of drugs 20 [11, 12]. For these different uses, biomaterials must possess a number of prop-21 erties. They must be biocompatible to avoid toxicity in contact with biological 22 tissues. Biodegradability is a desirable property for temporary implants, and 23 for minimally invasiv...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.