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Biomedical subjects

A Helias

Publications and source records attributed to A Helias.

18 recordsLinked to original sources
PubMed2002

MRI findings in a case of a superficial siderosis associated with an ependymoma.

We present the imaging findings of superficial siderosis of the central nervous system associated with an ependymoma of the posterior fossa in a patient who presented with progressive bilateral sensorineural hearing loss and cerebellar ataxia. The ependymoma was a homogeneous well-defined mass of the fourth ventricle without hydrocephalus. Secondary siderosis due to chronic bleeding from the ependymoma appeared as linear hypointensity delineating the surface of the cortex, thin and subtle on spin-echo T2-weighted images, thick and obvious on gradient-echo T2-weighted images.

Adult↗
PubMed1997

[Transient neurological manifestations disclosing spontaneous acute cervical epidural hematoma].

Spontaneous cervical epidural hematomas are uncommon lesions that usually produce permanent neurological deficit unless there is early surgical decompression. They are now well-recognized by scan X and especially by sagittal MRI of the spine. We describe 2 patients, a 24 year-old man and a 79 year-old woman with no previous history of trauma who were admitted in emergency for a sudden weakness of limbs, respectively a tetraplegia and a right hemiplegia. Both patients complained of inaugural and acute neck pain. Motor deficit completely resolved in few hours and MRI of the spine showed on T1 a signal isointense, extending respectively from C3 to C6 and C5 to C7, consistent with an hematoma. Laboratory data and angiography were normal. Surgery was recused. Neck pain lasted about a week. Follow-up MRI, in one case, was normal two months later. Cervical epidural hematomas revealed by transient neurological findings that completely and permanently resolved are exceptional. They could mimic ischemic myelopathy and should be considered in the differential diagnosis of other painful vascular conditions like symptomatic vertebral dissection to avoid inappropriate anticoagulation. Conservative management in these cases may be proposed if spontaneous neurological resolution is confirmed by MRI.

Acute Disease↗
PubMed1988

MR imaging of spinal cord arteriovenous malformations at 0.5 T: study of 34 cases.

Thirty-four patients with angiographically proved arteriovenous malformations of the spinal cord were studied between May 1986 and July 1987. Examinations were performed on a CGR 5000 Magniscan 0.5-T scanner with a surface coil in all cases, and multislices in both T1- and T2-weighted sequences were obtained in sagittal and axial planes. The results showed that MR can accurately diagnose all cases of intramedullary arteriovenous malformations, since transverse images were able to precisely locate the nidus within the spinal cord. Other types of spinal cord arteriovenous malformations were also studied (perimedullary fistulae and dural arteriovenous fistula), and the findings confirmed the value of MR in the characterization of these lesions as well.

Adult↗
PubMed1979

[Lumbar phelbography without catheterization. Technic, indications and results in the diagnosis of intervertebral disk herniation].

The authors present a new method of lumbar phlebology without catheterism by direct venous puncture of the femoral veins. An analysis of 300 contrast tests maked it possible to identify different types of pathological images characterized by disappearance and displacement of epidural veins corresponding as a rule to discal hernia when the uncharacteristic shadowy images do not allow one to make a precise conclusion or to determine whether an operation is needed. With equal reliability (96 percent), lumbar phlebography without catheterism is, by its simplicity and harmlessness and the absence of minor and major venous complications, preferable to phlebography by catheterism. Carried out in all subjects, whatever their age, without special precautions, it seems to us to now be the most desirable test to be used in the radiological investigation of lumbar discal hernias.

Epidural Space↗
PubMed1977

[Pleural manifestations of secondary monoclonal dysproteinemia (apropos of 4 cases)].

A pleural effusion with monoclonal macroglobulinemia is not unusual outside Kahler and Waldenström diseases which are the two commonest. It can occur in lymphoid leucosis with plasma concentration peaks, where surface immunoglobulins play an important part, and in some epithelial cancers. As in primitive macroglobulinemia the plasma concentration peak corresponds to pleural globulin modifications. But it seems that, whatever the variations of pathological immunoglobulins, the pleural lymphocytes, predominant in the effusion, play an active part due to various etiological stimulations.

Aged↗