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Biomedical subjects

G Crouzet

Publications and source records attributed to G Crouzet.

At least 37 records · Page 2Linked to original sources
PubMed1986

[Segmentation of the lumbar radicular canal].

The lumbar CT horizontal sections identification requires three levels to be defined of each vertebra: The arthropedicular level (upper third) describes an (omega) at the back with its dense bone structures. At each side of the canal is the upper part of the lateral recess, the narrowest and therefore the most threatened part of the nerve root passage. The isthmopedicular level (middle third) describes a complete bone ring around the vertebral canal. On this non articular level, the congenital dysplasia is most clearly observed. The subpedicular level (lower third) with its muscular surrounding, shows a floral outline. A fourth level, intervertebral or discal, is added. It is very similar to the last one and of course is the most common point of disco-radicular conflict. Each level appears to be specific, both by the silhouette outlined by the ligament and bone structures and by the relationship which they have with the meninges. Each of them has its own pathology which precisely directs the surgical approach.

Humans↗
PubMed1986

[Magnetic resonance imaging in multiple sclerosis. Sensitivity and correlation with the clinical picture].

The aim of imaging the brain in Multiple Sclerosis (MS) is to prove the dissemination of lesions, so critical for the diagnosis and so difficult to ascertain clinically. Our study included 21 patients with clinically definite (12) and probable (9) MS. A 21 patients underwent a neurological standard examination, a double-dose delayed CT scan and a Magnetic Resonance Imaging with a superconducting 0.5 Tesla magnet. Jointed slices were performed with a T2-weighted Spin-Echo sequence (TE 60, 120; TR 2000 msec). MRI detected 640 lesions in 20 patients while CT scan detected only 24 lesions in 9 patients. Technical limiting factors are discussed. Abnormalities in MRI were high-intense spots, blotches and streaks, located predominantly in the periventricular area. Capping lesions were common around the ventricular horns. "Plaques" were visualized in the posterior fossa. For each patient, the total surface of the lesions was calculated and was found to be related with the presence of lesions and with the cortical atrophy on CT scan. A correlation between the surface of lesions calculated by MRI and the disability scale was found especially in the group of patients with clinically proven cerebral lesions, while patients with predominantly spinal forms had a significantly lower surface of lesions. This finding could yield a new quantitative evaluation of the MS pathologic process which could be used to assess therapeutic efficacy.

Adult↗
PubMed1984

[Epidural angiolipoma: a rare and curable cause of spinal cord compression].

A 48-year-old female developed a slowly progressive paraparesis due to a posterior epidural mass extended on several thoracic segments. Clinical and myelographic appearance was strongly in favour of metastasis, the most common tumors in the spinal epidural space. A laminectomy was carried out and disclosed an encapsulated epidural tumor which was loosely adherent to the dura matter. Histological features were those of an angiolipoma. A brief review of clinical and pathological characteristics of spinal lipomas is performed. Extradural spinal angiolipomas are unusual benign neoplasms. The results of surgical treatment in this location are mostly excellent.

Epidural Space↗
PubMed1983

[Myelographic diagnosis of radiculomeningeal metastases of carcinomas. Apropos of 10 cases].

The authors report ten cases of intra-arachnoid metastases affecting the spinal cord and its roots. These cases illustrate all the myelographic appearances seen: multiple nodular appearances, striated appearance related to thickening of the roots, failure to visualise one or more root sheaths, filling defect of varying regularity preferentially seen in the dural cul-de-sac, but also in the terminal part of the cord associated with varying degrees of block. Myelographic technique is essential of they are to be visualised: water soluble opaque agents and tomography, if possible by complex scanning alone ensure accurate analysis of the roots. This type of involvement raises a pathogenic problem regarding the exact mechanism of such metastases. The prognosis is very poor despite treatment based upon radiotherapy and chemotherapy.

Arachnoid↗
PubMed1978

[Two cases of pericranial sinuses (author's transl)].

The authors report two cases of "sinus pericranii" a rare vascular tumor of the skull, communicating with the meningeal veins or with the dural sinuses. The partial reduction in size of the tumor in the sitting position may aid the clinical diagnosis. The X ray diagnosis is highly enhanced by the direct injection of contrast medium into the tumor, leading to the visualization of the outflow in the miningeal veins, while external carotid angiography is normal. Step by step coagulation of the verious supply coming through the skull allows a non-bleeding surgical excision.

Child, Preschool↗
PubMed1976

[Anatomoclinical and angiographic study of a case of disseminated thromboangiosis with predominant cerebral manifestations].

The authors describe the case of a patient of 22 with hypertension and livedo reticularis who, after presenting with a left brachial monoparesis became progressively demented over a period of five years and died at the age of 27 from a cerebro-meningeal haemorrhage. Angiographically, diffuse distal obliteration of the cerebral arteries was seen with deep networks of the moyamoya type involving the lenticulostriate arteries; similar changes were present in the upper left limb. Histopathological investigations showed obliterative thromboangiitis affecting not only the cerebrum, the brain stem and the cerebellum, but also the viscera. Analysis of this case and consideration of the theoretical possibilities leads the authors to urge that thromboangiosis together with its cerebral manifestations should be considered a nosological entity.

Adult↗
PubMed1975

[Sylvian stenosis with networks of the Moya-Moya type. Anatomo-clinical observation].

The authors report an angiographic observation, where a stenosis of the left middle cerebral artery, with Moya-Moya networks, is described. The anatomical study has shown an atresy of the middle cerebral artery, and has confirmed the hypothesis of a supplying role played by the Moya networks. Most of their anatomical findings are in agreement with a malformative aspect, which is speculated by the authors to be related to the failure, at the embryon level, of a good development of the middle cerebral artery; in this way, Moya might represent the remaining features of primitive plexiform networks. From this particular anatomical observation, the authors discuss some nosological problems and propose the hypothesis of several groups, which may be related to the moment when the stenosis is suspected to occur.

Arterial Occlusive Diseases↗