RESUMO
The objective of this paper was to study the effect of sympathetic innervation on morphological and histochemical aspects of skeletal muscle tissue. Rabbit masseter muscle was studied using histochemical and immunohistochemical methods for periods of up to 18 months post-sympathectomy. The morphological and enzymatic characteristics of control masseter muscles were similar on both the left and right sides. The main features were muscle fibres with a mosaic pattern and a predominance of type IIa fibres, followed by type I. Type IIb fibres showed very low frequency. Sympathectomized animals showed varying degrees of metabolic and morphological alterations, especially 18 months after sympathectomy. The first five groups showed a higher frequency of type I fibres, whilst the oldest group showed a higher frequency of type IIb fibres. In the oldest group, a significant variation in fibre diameter was observed. Many fibres showed small diameter, atrophy, hypertrophy, splitting, and necrosis. Areas with fibrosis were observed. Thus cervical sympathectomy induced morphological alterations in the masseter muscles. These alterations were, in part, similar to both denervation and myopathy. These findings indicate that sympathetic innervation contributes to the maintenance of the morphological and metabolic features of masseter muscle fibres.
Assuntos
Plexo Cervical/cirurgia , Músculo Masseter/metabolismo , Simpatectomia/efeitos adversos , Tecido Adiposo/patologia , Animais , Atrofia/etiologia , Fibrose/etiologia , Hipertrofia/etiologia , Músculo Masseter/patologia , Fibras Musculares de Contração Rápida/patologia , Fibras Musculares de Contração Lenta/patologia , Necrose , Fagocitose/fisiologia , CoelhosRESUMO
We report a case of a carotid artery bifurcation aneurysm which ruptured into a silvian fissure arachnoid cyst. In the review of the literature, only three cases were before reported. We discuss about uncommon clinical findings, the surgical aspects and the associations among the lesions.
Assuntos
Aneurisma Roto/complicações , Cistos Aracnóideos/complicações , Aneurisma Intracraniano/complicações , Hemorragia Subaracnóidea/etiologia , Adulto , Aneurisma Roto/diagnóstico por imagem , Aneurisma Roto/cirurgia , Cistos Aracnóideos/diagnóstico por imagem , Cistos Aracnóideos/cirurgia , Angiografia Cerebral , Humanos , Aneurisma Intracraniano/diagnóstico por imagem , Aneurisma Intracraniano/cirurgia , Masculino , Tomografia Computadorizada por Raios XRESUMO
The authors report two female patients with chronic sensitive and motor findings in lower limbs caused by compression of distal branches of sciatic nerve by lipoma. Similar cases were not described on literature. Nerve conduction studies allowed to localize the exact site of compression. At surgery, lipomas compressing the deep peroneal nerve (case 1) and the posterior tibial nerve (case 2) were observed. Histologic studies of tumors confirmed the diagnoses.
Assuntos
Lipoma/diagnóstico , Síndromes de Compressão Nervosa/diagnóstico , Nervo Isquiático , Neoplasias de Tecidos Moles/diagnóstico , Adulto , Eletrodiagnóstico , Feminino , Humanos , Lipoma/patologia , Lipoma/cirurgia , Pessoa de Meia-Idade , Síndromes de Compressão Nervosa/patologia , Síndromes de Compressão Nervosa/cirurgia , Nervo Fibular/patologia , Nervo Fibular/fisiopatologia , Nervo Fibular/cirurgia , Nervo Isquiático/patologia , Nervo Isquiático/fisiopatologia , Nervo Isquiático/cirurgia , Neoplasias de Tecidos Moles/patologia , Neoplasias de Tecidos Moles/cirurgia , Nervo Tibial/patologia , Nervo Tibial/fisiopatologia , Nervo Tibial/cirurgiaRESUMO
O levantamento retrospectivo de 100 pacientes submetidos a derivacoes liquoricas subdivididos em dois grupos, 50 derivacoes ventriculo-periotoniais e 50 derivacoes ventriculo-atriais, permitiu a analise comparativa do desempenho de outros procedimentos a partir de sua indicacao nas hidrocefalias de diferentes causas suas complicacoes e as evolucoes dos pacientes