نتایج جستجو برای: paragangliomas
تعداد نتایج: 1098 فیلتر نتایج به سال:
BACKGROUND Phaeochromocytomas and paragangliomas are neuro-endocrine tumours that occur sporadically and in several hereditary tumour syndromes, including the phaeochromocytoma-paraganglioma syndrome. This syndrome is caused by germline mutations in succinate dehydrogenase B (SDHB), C (SDHC), or D (SDHD) genes. Clinically, the phaeochromocytoma-paraganglioma syndrome is often unrecognised, alth...
Epileptic seizures have been associated with increased catecholamine levels, however, direct proof is lacking. We report a case with catecholamine secreting extra-adrenal paragangliomas and a continuous state of epilepsy not responding to therapy. The epileptic seizures resolved after resection of the paragangliomas and normalization of catecholamine excretion.
Doppler color flow imaging is a new ultrasound method for the simultaneous spatial display of tissue and vessel morphology (B-mode echotomograms) and of color-coded blood flow velocity information (Doppler-mode analysis). This new method is particularly useful in the neck, not only for the assessment of brain arteries but also for the safe and valid identification of carotid paragangliomas comp...
Let φ : P → P be a rational map defined over a field K. We construct the moduli space Md(N) parameterizing conjugacy classes of degree-d maps with a point of formal period N and present an algebraic proof that M2(N) is geometrically irreducible for N > 1. Restricting ourselves to maps φ of arbitrary degree d ≥ 2 such that h ◦ φ ◦ h = φ for some nontrivial h ∈ PGL2 `
137 The paraganglion system, a component of the neuroendocrine system, comprises the adrenal medullae and the extra-adrenal paraganglion system. Tissues of the extra-adrenal system have been classified into 4 groups: branchiomeric (associated with arterial vessels and cranial nerves derived from the branchial arches); intravagal; aorticosympathetic; and visceral-autonomic (including cardiac atr...
INTRODUCTION Paragangliomas (PGLs) related to hereditary syndromes are rare mediastinal tumors. Paragangliomas are caused by mutations in genes encoding subunits of succinate dehydrogenase enzyme (SDH). AIM To evaluate clinical, anatomical and functional characteristics of mediastinal paragangliomas related to SDHx gene mutations. MATERIAL AND METHODS Retrospective analysis of 75 patients w...
Paragangliomas are highly vascularised and often heritable tumours derived from paraganglia, a diffuse neuroendocrine system dispersed from skull base to the pelvic floor. The carotid body, a small oxygen sensing organ located at the bifurcation of the carotid artery in the head and neck and the adrenal medulla in the abdomen, are the most common tumour sites. It now appears that mutations in S...
Abstract Paragangliomas are tumors of the neuroendocrine system, which arise from neural crest and chemoreceptor cells. They can be found in adrenal gland, aortic arch, jugular bulb or at level cochlear promoter. Glomus grow slowly, well vascularized, invasive locally aggressive. Because their anatomic relation with bulb, internal carotid artery, facial nerve cranial nerves IX, X, XI, XII, pati...
BACKGROUND Differentiating paragangliomas from moderately differentiated neuroendocrine carcinoma in the larynx is a difficult management problem. As the biological behavior of these 2 entities is different, we developed an algorithm for the preoperative diagnosis and treatment of this disease. DESIGN The sample case from which the algorithm was developed consisted of a 69-year-old man who wa...
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