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J L Renard

Publications and source records attributed to J L Renard.

17 recordsLinked to original sources
PubMed1996

DNA polymorphism among Fusarium oxysporum f.sp. elaeidis populations from oil palm, using a repeated and dispersed sequence "Palm".

A worldwide collection, of 76 F. oxysporum f.sp. elaeidis isolates (Foe), and of 21 F. oxysporum isolates from the soil of several palm grove was analysed by RFLP. As a probe, we used a random DNA fragment (probe 46) from a genomic library of a Foe isolate. This probe contains two different types of sequence, one being repeated and dispersed in the genome "Palm", the other being a single-copy sequence. All F. oxysporum isolates from the palm-grove soils were non-pathogenic to oil palm. They all had a simple restriction pattern with one band homologous to the single-copy sequence of probe 46. All Foe isolates were pathogenic to oil palm and they all had complex patterns due to hybridization with "Palm". This repetitive sequence reveals that Foe isolates are distinct from the other F. oxysporum palm-grove soils isolates. The sequence can reliably discriminate pathogenic from non-pathogenic oil palm isolates. Based on DNA fingerprint similarities, Foe populations were divided into ten groups consisting of isolates with the same geographic origin. Isolates from Brazil and Ecuador were an exception to that rule as they had the same restriction pattern as a few isolates from the Ivory Coast, suggesting they may originated from Africa.

Fusarium↗
PubMed1994

[Subacute leukoencephalopathy of the rhombencephalon after pituitary radiotherapy].

Two patients had early delayed leucoencephalopathy mainly confined to the brainstem after radiotherapy for pituitary tumours. To our knowledge, we report the first MRI description. The patients had somatotroph cell adenomas (associated with prolactin secretion, patient 2). Surgical removal of the adenomas were complete (patient 1) and partial (patient 2). Both underwent pituitary irradiation: patient 1, 55.8 Gy (31 x 1.8 Gy); patient 2, 54 Gy (27 x 2 Gy). Six weeks after completion of radiation, the patients had low vigilance, sleepiness, cerebellar symptoms, optic neuropathy (patient 1), CSF inflammatory reaction. T2-weighted MRI scans showed hypersignal in brainstem, cerebellar peduncles (both patients), temporal lobe white matter (patient 2). T1-weighted images showed hyposignals, pseudonecrotic and contrast-enhanced images in brainstem (patient 1). Both patients responded to intravenous then oral steroid treatment with a progressive and complete clinical recovery. Radiological abnormalities improved with clinical statement. Present characteristics support a demyelinating mechanism of early delayed cerebral radiation injuries.

Adenoma↗
PubMed1992

[Contribution of transesophageal echocardiography in the investigation of the atrium in systemic embolism].

Transesophageal echocardiography (TEE) is a semi-invasive examination that provides better images of the atrium than classical transthoracic echocardiography (TTE) due to the anatomical positioning of the captor and the high frequency Doppler apparatus used. We used TEE and TTE to evaluate the incidence of the cardiac origin of emboli in 46 patients with unexplained stroke or transient ischemic attack (TIA): 23 had documented heart disease (mean age 60 years) and 23 had no cardiac disease (mean age 43 years). Among those with existing heart disease, 4% of the anomalies certainly or probably responsible for the emboli in addition to the underlying cardiopathy were detected by TTE versus 37% by TEE (as compared to values reported in the literature: 25% by TTE and 51% by TEE). In particular, 4 abnormalities were better visualized by TEE: left atrial thrombus, especially those located in the auricle (5 TEE versus 1 TTE); spontaneous contrast showing the swirl of blood stagnating in the dilated left atria of patients with mitral valve disease seen in 7-39% of the TIA by TEE as compared to less than 1% by TTE (3 TEE versus 0 TTE); aneurysm of the interauricular septum (AIAS) observed in 5-16% of the TIA by TEE as opposed to 0-1% by TTE (4 TEE versus 1 TTE); patent foramen ovale (PFO) was noted more frequently following injection of a contrast medium when visualized by TEE (19-22%) than by TTE (6-8%) and can explain the passage of a paradoxical embolus (1 TEE versus 0 TTE). The incidences of left atrial thrombus, AIAS and PFO are well correlated with systemic emboli, especially in young adults having experienced an unexplained TIA without underlying cardiopathy. TEE is an easy-to-use and well tolerated technique for detecting the cardiac origin of emboli in unexplained stroke. Whether to opt for a medical or surgical treatment to avoid recurrences is discussed.

Adult↗
PubMed1990

[Peripheral neurofibromatosis and involvement of lumbosacral nerves. Value of imaging].

We report a case of giant plexiform neurofibromatosis revealed by a sensori-motor, axo-myelinic polyneuropathy. Only the lumbar and sacral spinal nerves were involved in this peripheral form of Von Recklinghausen's disease. The polyneuropathy was due to compression of the nervous fibers by the neurofibromatous tumors. Ultrasonography DTPA 99 m Technetium scintigraphy, CT and MRI were the diagnostic procedures. MRI proved superior to CT in demonstrating the extent of the lesions. Biopsy confirmed the diagnosis. This form of neurofibromatosis did not involve the central nervous system, cranial nerves of cervicothoracic spinal nerves and roots; nor was there any visceral involvement, particularly endocrine neoplasia.

Adult↗
PubMed1990

[Complex temporal partial status epilepticus].

The cases of non convulsive, complex, partial ailment are a cause of a confusional state. Such a case on an adult is here reported, and its clinical presentation was a unvarying forgetfulness together with elements of a frontal syndrome. The aetiology was most probably a viral meningo-encephalitis. Clinical semiology of these "EMPC" is variable, either made of partial, recurrent attacks, sometimes with automatisms, or made of a continuous, possibly fluctuating, confusional state. Attacks shown on the EEG are partial or generalized with a variable start, sometimes bilateral, even continuous or discontinuous. The onset is most often temporal or frontal. The cause is very rarely found out. The evolution is usually good, but extended deficiencies of memory are described, linked to the duration (more than 12 hours) of EMPC. Therefore, the treatment must be precocious using diazepam or phenytoin.

Encephalitis, Arbovirus↗
PubMed1988

[Post-pneumonectomy pyothorax with and without broncho-pleural fistula].

This study reports the experience of the medical centre of Villiers Saint-Denis, where about 40 cases of pyothorax with or without broncho-pleural fistula were seen between 1975 and 1981. The authors describe their method to drain and wash the pleural cavity. They use a single chest tube with an irrigation system in simple empyema and two chest tubes with an irrigation system when they must close a broncho-pleural fistula. With this method, the infection was eradicated in 90% of the cases, and the broncho-pleural fistula closed within about 4 months in 80% of the cases. This method is compared with other methods used to treat pyothorax.

Adult↗
PubMed1987

[Primary lymphoma on a pouch following collapse therapy].

The development, often after a long delay, of cancer in post-pneumothorax pouches is well known. A case of lymphoma developed on such a pouch is reported. Although cases of lymphoma developed on pulmonary scars have been published, we were unable to find in the literature cases of lymphoma developed on a sequela of old therapeutic pneumothorax.

Aged↗