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Biomedical subjects

Y Guegan

Publications and source records attributed to Y Guegan.

At least 19 recordsLinked to original sources
PubMed2006

Acute presentation of hydromyelia in a child.

The authors document a rapid development, within 3 weeks, of hydromyelia in a 12 year-old boy. The boy was admitted to a local hospital because of drowsiness and persistent severe neck pain. Neurological examination disclosed a lethargic boy with no neurological deficit other than Parinaud's sign. During his transfer to our department, he presented a cardio-respiratory arrest with coma and bilateral mydriasis. External ventricular drain and craniocervical decompression achieved excellent clinical and neuroradiological outcomes. The development of hydromyelia in this case is caused by obstruction to the natural cerebrospinal fluid pathway at the craniocervical junction and the cardio-respiratory arrest is provoked by a brain stem compression against the clivus and odontoid process. This report illustrates that hydromyelia may complicate acute obstructive hydrocephalus due to acquired Chiari malformation.

Arnold-Chiari Malformation↗
PubMed2006

Intraneural ganglion cyst of the tibial nerve.

Intraneural ganglion cyst of the tibial nerve is very rare. To date, only 5 cases of this entity in the popliteal fossa have been reported. We report a new case and review the previously reported cases. A 40-year-old man experienced a mild vague pain in the medial half of his right foot for 3 years. Magnetic resonance imaging scan demonstrated a soft-tissue mass along the right tibial nerve. At surgery, an intraneural ganglion cyst was evacuated. After 12 months, the patient was pain-free with no signs of recurrence. Trauma might be a contributing factor to the development of intraneural ganglion cysts. Application of microsurgical techniques is encouraged.

Adult↗
PubMed2005

Intracranial epidural haematomas in elderly patients: observations in 14 patients.

BACKGROUND: Up to now, extra-dural haematomas (EDH) in elderly patients have been known for their poor prognosis and few studies have focused on the particularity of EDH in the elderly. Most clinical studies relating to EDH have generally focused on its occurrence in children and the middle-aged, grouping people of over 50 and 60 years together as the elderly. The purpose of this paper is to present a series of EDH cases in the elderly. METHOD: 500 EDH patients (of all ages) were admitted to our Department from January 1990 to December 2003 and this is a retrospective study of 14 of those patients who were aged 70 years and over. FINDINGS: The study consists of 8 women and 6 men with an average age of 74 years. A high incidence of disease predisposes elderly to falls, which are the most frequent cause of head trauma. The elderly are less likely to manifest signs or symptoms of increased intracranial pressure due to cerebral atrophy, and almost all haematomas occurred in the parietal area. Post-operative results were satisfactory and only one death was recorded. CONCLUSION: This study shows that the elderly, presenting EDH after a fall, have a better prognosis than is often feared.

Accidental Falls↗
PubMed2001

Intracerebral hemorrhage complicating cervical "hourglass" schwannoma removal. Case report.

The authors report a case of infra- and supratentorial intracerebral hemorrhage complicating the postoperative course of a patient who had undergone surgical removal of a cervical schwannoma with an hourglass configuration. To their knowledge, this is the first case in which this neurosurgical procedure was followed by such a complication. Possible mechanisms are discussed; however, pathological events leading to this complication are unclear. The development of new neurological deficits not attributable to the surgical procedure should suggest this possibility.

Adult↗
PubMed2001

[Extraosseous Ewing's sarcoma of the spinal epidural space].

Ewing's sarcoma is found exceptionally as a primary epidural tumor of the spine. Four cases of extraosseous Ewing's sarcoma of the spinal epidural space are presented. Another 17 cases were found in the pertinent literature and are discussed. There were 15 males and 6 females with mean age of 16 years (range, 4 to 30). Symptoms included back pain and/or radicular pain, paresis of one or more limbs, sensory disturbances, and bladder and bowel dysfunction. The mean diagnostic delay was 4,7 months. Each patient underwent surgery but complete resection of the tumor was obtained in only half of the cases. Most patients received radiation therapy and chemotherapy. Twelve patients died, 1 to 54 months (mean, 18) after diagnosis. Even though the number of patients was too small in this series for statistical analysis, partially resected tumors do appear to be associated with a higher mortality.

Adolescent↗
PubMed2000

[Expanding mature pineal teratoma syndrome. Case report].

We present a case of growing teratoma syndrome of the pineal region. To our knowledge, this is the fourth case reported in the literature. A 13-year-old boy was referred for intracranial hypertension and bilateral papillary edema. CT scan showed a pineal region tumor with obstructive hydrocephalus. After CSF (cerebrospinal fluid) shunting, MRI showed that the tumor had a heterogenous signal enhancement. The tumor marker HCG (human chorionic gonadotrophin) was elevated in CSF and serum. After three cycles of chemotherapy, MRI showed an important increase in tumor size with morphologic modifications. However, HCG in CSF and serum returned to normal. Surgical resection was performed and histological examination of the whole specimen showed mature teratoma. On postoperative MRI, there was a small area of signal enhancement of the left thalamus. Radiotherapy was given. The child was in complete remission 15 months after the diagnosis. Growing teratoma syndrome is a mixed germ cell tumor with a secreting portion that responds to chemotherapy and a non secreting portion of mature teratoma that continues to grow under chemotherapy. The treatment should include chemotherapy for the malignant secreting portion and surgery for the mature teratoma.

Adolescent↗
PubMed1999

Anatomic bases for the compression and neurolysis of the deep branch of the radial nerve in the radial tunnel.

The anatomy of the radial tunnel was studied on twenty-five elbow preparations. We noted five different elements that could affect the deep branch of the radial nerve in the radial tunnel and cause an entrapment syndrome: a capsule-tendon-aponeurotic complex on the anterior aspect of both the humeroradial joint and the radial head, the vascular arcade formed by the radial recurrent a, and its branches, the arcade formed by the medial edge of extensor carpi radialis brevis muscle, and the superior and inferior arcades of the superficial layer of the supinator muscle. These results are compared with recent anatomical and clinical data, and the relevance of a surgical approach between the extensor carpi radialis brevis and longus muscles is discussed.

Cadaver↗
PubMed1998

[Gene therapy of cerebral glioblastoma by adenovirus vector. Experimental model in the rat].

Our aim was to test the therapeutic effects of adenovirus-mediated gene therapy in an animal brain tumor model which was obtained by stereotactic injection of 9L gliosarcoma cells into the caudate nucleus of rat brains. Seven days after the implantation of tumor cells, adenovirus vectors bearing the Escherichia coli beta-galactosidase gene (ADVbgal) or the herpes simplex virus thymidine kinase gene (ADVtk) were stereotactically injected into the tumor. Injection of the ADVbgal resulted in the expression of the marker gene in 11 animals. Transfer of the ADVtk was followed, 3 days later, by intraperitoneal injection of ganciclovir (GCV) for 10 days. A control group was treated with saline instead of GCV. We observed a significant regression of the tumors in the rats treated with ADVtk and GCV as compared with control animals. In four cases the tumor completely disappeared after treatment. These results demonstrate the potential efficacy of adenovirus-mediated transfer of the HSVtk gene following by GCV administration for the treatment of glioblastomas.

Adenoviridae↗
PubMed1997

[Gene therapy of a model of glioblastoma in rats using adenovirus vector encoding the HSVtk gene].

Our aim was to test the therapeutic effects of adenovirus-mediated gene therapy in an animal model of brain tumor which was obtained by injection of 9L gliosarcoma cells into the caudate nucleus of rat brains. Seven days after the implantation of tumor cells, adenovirus vectors bearing the Escherichia coli beta galactosidase gene (ADV beta-gal) or the herpes simplex virus thymidine kinase gene (ADVtk) were stereotactically injected in the tumor. Injection of the ADV beta gal resulted in the expression of the marker gene in 61% of the animals. Transfer of the ADVtk was followed, 3 days later, by intraperitoneal injection of ganciclovir (GCV) for 10 days. A control group was treated with saline instead of GCV. We observed a significant regression of the tumors in 50% of the rats treated with ADVtk and GCV as compared with control animals. In 4 cases out of 6, the tumor completely disappeared after treatment. These results demonstrate the potential efficacy of adenovirus-mediated transfer of the HSVtk gene following by GCV administration for the treatment of glioblastomas.

Adenoviridae↗
PubMed1992

Unusual combination of Cis platinum and radiotherapy followed by a three fractions per day irradiation in splitcourse: a phase I-II study in brain glioma patients.

An unusual protocol based on a preliminary clinical study on cylindromas metastasized to the lung was proposed to brain glioma patients: Day 2 100 mg/m2 i.v. Cis platinum (Cis PII) followed at days 3 and 5 by 6 Gy irradiation (RT) in two fractions and three days. Five cycles were scheduled at 21 days interval. On disease progression a three fractions per day radiotherapy regimen (3 FRT) in split-course (two series of 22.50 Gy in 15 fractions and five days separated by a two weeks period of rest) was then delivered to the patients. All patients had a measurable mass on the CT scan. 19 were entered into the study: 13 as first line therapy (group A) and six for salvage treatment (group B). Tolerance was globally good. Eight patients were considered responders at the end of five cycles of Cis PII-RT. They were all group A patients. Median symptom-free interval was six months for the whole population. Survival was twelve months. The 3 FRT was well tolerated but does not seem to have improved the therapeutic gain of the chemoradiotherapy combination. The present study concerns patients whose prognosis was poor on inclusion: surgery inadvisable or unsatisfactory and diagnosis mainly based on biopsy only. The number and the duration of responses justify further study into Cis PII as first line therapy as either an effective cytotoxic drug or a potential radio enhancer.

Adult↗
PubMed1990

Aldehyde dehydrogenase activity in xenografted human brain tumor in nude mice. Preliminary results in human glioma biopsies.

ALDH activity measured fluorimetrically using a high concentration of aliphatic aldehyde as substrate was studied in human glioblastomas grafted in nude mice. Compared with normal brain, ALDH activity is significantly increased in malignant glioma tissue, especially in the cytosolic subcellular fraction. Correlatively, in comparison with normal brain tissue, MDA levels were significantly reduced in whole homogenates and in cytosolic fractions of xenografted glioblastoma tissue. Preliminary results concerning human malignant glioma biopsies are in good agreement with our experimental data. In view of previous works, these results suggest a relationship between alterations in ALDH iso-enzymes activities and cytosolic aldehyde concentrations with respect to normal or tumoral cell growth.

Aldehyde Dehydrogenase↗
PubMed1987

Down-beat nystagmus: case report with magnetic resonance imaging and surgical treatment.

A woman with down-beat nystagmus (DBN) underwent magnetic resonance imaging (MRI), which showed a syringomyelic cyst in the medulla. Surgical treatment of the cyst ended the abnormal eye movement. This case demonstrates the use of MRI for the diagnosis of DBN. It also shows the value of surgical treatment when a cyst is responsible for this symptom, as in Arnold-Chiari malformation.

Adult↗