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The neurofibromatosis-Noonan syndrome: genetic heterogeneity versus clinical variability. Case report and review of the literature.

We report on a discordant twin male with neurofibromatosis and manifestations of the Noonan syndrome. He has multiple café-au-lait spots and axillary freckling, relative macrocephaly, ptosis, mid-face hypoplasia, short neck and pulmonic stenosis. The presence of neurofibromatosis associated with Noonan syndrome phenotype in our patient raises the question of a unique disorder sharing characteristics of both conditions.

Adolescent↗

Genetic alterations and growth factors in the pathogenesis of von Recklinghausen neurofibromatosis.

This paper is a summary review of recent developments with regard to the pathogenesis of von Recklinghausen neurofibromatosis, or NF-1. In the section on molecular biology of NF-1, the focus is on genetic linkage, with a note about prenatal diagnosis, tumor genetics and animal models. In the section on growth factors and receptors, the first element deals with neurofibromatosis as a model of cellular interaction, and particularly the issues of dysplasia versus neoplasia, cell-cell interactions and 'vicious cycle' positive feedback mechanisms; additional elements focus on nerve growth factor-beta, Schwann cell mitogens and other growth factors. In the last section, the focus is on further developments in terms of molecular biology, but with additional emphasis on the need for very intense input from the clinicians characterizing the many phenotypes of NF-1 and its NF and non-NF alternatives.

Chromosomes, Human, Pair 17↗

[Somatostatin-producing endocrine pancreatic tumor in Recklinghausen's neurofibromatosis. Case report and literature review].

Somatostatin-producing tumors of the pancreas were first described in 1977. In 1983 a syndrome involving multiple endocrine neoplasias (MEN) was named type III A. This syndrome consists of carcinoid of the duodenum, often producing somatostatin, and von Recklinghausen's disease (neurofibromatosis) or pheochromocytoma. The case is reported of a 62-year-old man with familial neurofibromatosis and a tumor of the head of the pancreas spreading into pars II of the duodenum. After Whipple's duodenopancreatectomy the patient exhibited no further symptoms. Immunohistochemistry served to prove the production of somatostatin and small amounts of calcitonin in the tumor.

Adenoma, Islet Cell↗

Neurofibromatosis in children.

The clinical diagnosis of neurofibromatosis in childhood will usually be based on the presence of numerous café-au-lait spots. Early diagnosis allows for continuing follow-up and appropriate counselling. Symptomatic therapy can be provided if necessary. The disorder has a tendency via its mesodermal route to affect almost every system in the body; however, few laymen have even heard of the disorder and, except for the "Elephant Man" notoriety, are totally unaware of it, whereas muscular dystrophy, cystic fibrosis, and Down syndrome although occurring less frequently are well known to the general public. The management of neurofibromatosis in children covers an extremely wide spectrum: at times the management appears to be simple, involving little more than clinical evaluation and simple investigations. However, in view of the protean manifestations of the condition, a complete history including family history is obligatory, and investigation must include radiographic studies of the abdomen, chest, spine, and skull, the latter to include special views of the orbits and optic foramina. My investigation of this disorder has been extremely frustrating because of the progressive character of the disease. Nothing seems to alter the natural course of the disease. I cannot say that my investigative efforts have revealed any breakthroughs in treatment. An aggressive surgical approach to the myriad of lesions associated with this disease, especially neuromata or segmental problems, is probably advisable. The early treatment of tibial pseudarthrosis by polyprophylene orthotic and pulsating electromagnetic fields shows encouraging results over the short course, although I am not so sure as to whether or not the patients would do as well with the custom fit orthotic with or without the electronics. Early stabilization of spinal deformity has proven to be more than moderately successful and is strongly recommended following appropriate intraspinal evaluation. The management of tumors of the brain and spinal cord, as well as those associated with limb hypertrophy and congenital tibial pseudarthrosis, is undergoing innovations at this time which may result in a better cure rate. Procedures include the use of CT to evaluate tumors [Coleman et al. have attempted to differentiate neurofibromas from neurofibrosarcoma by contrast enhancement methods], the use of CO2 lasers to remove previously inoperable CNS tumors, microvascular bone transplantation and pulsating electromagnetic field to treat pseudarthrotic bones.4+he National

Bone Diseases↗

[Regressive hypertrophic myocardiopathy in an infant with Recklinghausen's neurofibromatosis].

A case of neonatal hypertrophic cardiomyopathy (HCM) without obstruction is reported. Von Recklinghausen neurofibromatosis in the mother and several relatives and the occurrence of café-au-lait spots in the child at 6 weeks of life led to the association of HCM with this phacomatosis. The spontaneous regression of the myocardial hypertrophy after 6 weeks makes this first report of neonatal HCM in the course of Von Recklinghausen neurofibromatosis peculiar. Several reports in the literature mention the possibility of such a spontaneous regression of HCM or diffuse cardiac tumors, especially in the course of phacomatosis.

Cardiomyopathy, Hypertrophic↗

Von Recklinghausen's neurofibromatosis.

More is being learned each year about the manifestations of neurofibromatosis, but unfortunately no cure has been found. In otolaryngology we see patients with this disease presenting a wide variety of pathology, which can include any of the regions or organs of the head and neck. Table 1 summarizes the otolaryngic manifestation of von Recklinghausen's disease. A well thought out management plan usually requires some sort of surgical management, as well as close coordination with other medical and surgical specialists who are also treating the patient. Due to the multiple organ system involvement in neurofibromatosis, a team approach is the most beneficial for the patient's progress and assistance in leading as functionally and cosmetically normal a life as possible.

Adolescent↗

SPECT imaging of para-axial neurofibromatosis with technetium-99m DTPA.

Single photon emission computed tomography (SPECT) was used to study uptake of technetium-99m diethylenetriaminepentaacetic acid ([99mTc]DTPA) by para-axial neurofibromas in 13 patients. SPECT imaging led to better resolution of uptake in nine instances and detection of 12 lesions unsuspected on planar imaging (PI). Two false-positive instances and one false-negative instance of uptake are described. The planning of the surgical approach and placement of graft material for spinal fusion was assisted by SPECT in two patients. One patient with disability secondary to recurring abdominal pain had detection of the causative lesion by SPECT and subsequent relief of her symptoms following excision of the tumor. SPECT imaging of soft-tissue tumors of neurofibromatosis appears to have potential use in preplanning surgery on structural or cosmetic lesions, in the detection of occult lesions, and the monitoring of patients with neurofibromatosis at regular intervals.

Adolescent↗

MR imaging of optic pathways in patients with neurofibromatosis.

Twenty-one patients with documented neurofibromatosis had MR examinations to evaluate possible intracranial disease. In five cases the indication was a known or suspected optic glioma. Two patients were examined because of a history of seizures; the rest were examined as part of a baseline evaluation. Eighteen patients showed evidence of signal hyperintensity on T2-weighted images. Lesions involved the optic nerves, optic chiasm, optic tracts, lateral geniculate body, optic radiations, basal ganglia, periventricular white matter, cerebellar white matter, and dentate nucleus of the cerebellum. Comparison between MR and concurrent CT scans showed MR to be superior in demonstrating the posterior extent of optic-pathway gliomas. In addition, MR showed focal areas of hyperintensity in the basal ganglia, internal capsule, cerebellum, and/or white matter that were not detected on CT. Although we found MR to be superior to CT in detecting intracranial tumors in patients with neurofibromatosis, and in evaluating the extensive involvement of known lesions, the full clinical implications of our findings remain to be determined.

Adolescent↗

Multifocal intracranial MR abnormalities in neurofibromatosis.

MR imaging of four children with neurofibromatosis demonstrated areas of increased T2 signal involving widespread multifocal regions of basal ganglia and brainstem. Such abnormalities have not been previously reported. No corresponding CT abnormalities were present. These regions may represent hamartomatous or low-grade gliomatous change, and appear to be characteristic of neurofibromatosis in children.

Child↗

[Malignant melanoma of the penis associated with von Recklinghausen's neurofibromatosis: report of a case].

A 69-year-old male patient visited our clinic with complaints of dysuria and bleeding at the glans of penis on May 2, 1985. At the first presentation the tumor mass with necrotic and hemorrhagic character was localized around the urethral orifice and the entire glans of penis had a hard consistency. Moreover, numerous soft cutaneous nodules ranging from a small bean to a hen's egg in size spread over the total body surface. The nodules varied in property from even in height on the skin surface, half-spherical, and pedunculated. His family history was not contributory as far as neurofibromatosis was concerned. On May 15, the glans of penis was amputated and histological diagnosis was malignant melanoma with marked vascular and neural permeation. Review of the literature showed that our patient is the third case of malignant melanoma associated with neurofibromatosis in Japan.

Aged↗

Isolated optic nerve gliomas in children with and without neurofibromatosis.

With the advent of noninvasive neuroimaging of the orbits and brain, many asymptomatic patients with intraorbital optic gliomas have been identified. These children, predominantly with neurofibromatosis, present a therapeutic quandary to the treating physician. There is no consensus regarding either the natural history of intraorbital optic gliomas or the approach treatment. This paper reviews the literature on the treatment of 227 children with intraorbital optic gliomas with surgery, radiation or 'watchful waiting'. Based on this review, an approach to the management of children with intraorbital optic gliomas with and without neurofibromatosis is suggested.

Child↗

Vascular dysplasia of arteries in neurocristopathies: a lesson for neurofibromatosis.

In a 15-year-old girl suffering from congenital constipation, megacolon combined with a 'Ranken neuroma' of the rectum and a short aganglionic segment of distal colon was observed. The specific vascular alterations in the region of the Ranken neuroma (which has previously been described in cases of von Recklinghausen neurofibromatosis) were studied, with an emphasis on immunohistochemical methods. The results suggest that the pericytes are the cells primarily involved in the distinctive alterations of the blood vessels. Respecting the similarities of the location and vascular alterations in the neurocristopathies, von Recklinghausen neurofibromatosis and Hirschsprung's disease, to those seen in vascular fibromuscular hyperplasia, the possible pathogenetic relationships of these kinds of vascular malformations are considered.

Adolescent↗

Von Recklinghausen neurofibromatosis with carcinoid tumor and submucous leiomyomas of the duodenum.

We report on a 63-year-old man with von Recklinghausen neurofibromatosis who developed a carcinoid tumor in the periampullary region and multiple small-sized leiomyomas in the duodenal wall. A high prevalence of gastrointestinal carcinoids has previously been recognized in patients with von Recklinghausen neurofibromatosis, the commonest site of origin being the duodenum or the periampullary region. The association of both conditions seems to be more than casual. Abnormalities in the development of the complex of von Campenhout or high circulating levels of nerve growth factor have been the mechanisms postulated to account for this association.

Carcinoma↗

Intestinal neurofibromatosis. Multiple complications in a single case.

The use of radionuclide gastrointestinal scanning with 99mTc sulfur colloid, supplementing angiography, is described in the diagnosis of the source of bleeding in a 60-year-old woman with neurofibromatosis. These two procedures succeeded in locating the origin of bleeding from neurofibroma in the jejunum, which was corrected by surgery. To our knowledge, this case report is the first description of a patient with neurofibromatosis, with all the reported gastrointestinal symptoms: intermittent abdominal pains, palpable abdominal mass, gastrointestinal bleeding and small bowel obstruction.

Digestive System↗

[Multiple neurogenic tumors and dorsal vertebral cavities-- characteristic findings in Recklinghausen's neurofibromatosis. A case contribution].

The neurofibromatosis, with or without the characteristic skin changes, often shows typical radiological findings of the skull and the spinal column. The computer tomography (CT) provided evidence of the exact extent and localisation of the neurofibromatous tumours and their malignant transformations. The large variety of neurofibromatosis is illustrated and demonstrated in a case of a young woman with multiple neurogenic tumors and vertebral scalloping. The problems are discussed by the relevant literature.

Adrenal Gland Neoplasms↗

[Multiple vascular stenoses in neurofibromatosis (author's transl)].

Vascular lesions due to neurofibromatosis have been predominantly reported in the renal arteries as cause of arterial hypertension, but they can occur everywhere. The angiography shows a smoothly bordered stenosis at the origin of the artery with an elongated funnel shaped poststenotic deformity. Collateral vessels are often present. Reconstructive arterial surgery is in a high percentage successful. The main differential diagnosis includes fibromuscular dysplasia. Arterial hypertension in a young person with neurofibromatosis should suggest the presence of pheochromocytoma or renovascular disease.

Arterial Occlusive Diseases↗

Sectoral retinal pigmentation in neurofibromatosis.

Sector retinitis pigmentosa of Bietti has not been studied histopathologically and has not been reported as occurring in a patient with neurofibromatosis. This report describes a patients with neurofibromatosis and biopsy-proven optic nerve glioma who was noted before death to have bilateral sectoral retinal pigmentary disturbances that appeared histopathologically to be areas of retinitis pigmentosa.

Eye Neoplasms↗