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Biomedical subjects

D Reizine

Publications and source records attributed to D Reizine.

82 records · Page 5Linked to original sources
PubMedDate not supplied

Aneurysms of spinal arteries associated with intramedullary arteriovenous malformations. I. Angiographic and clinical aspects.

PURPOSE: To evaluate the nature of aneurysms of the spinal arteries, their relative frequency, and the risks associated with these lesions. METHODS: We retrospectively reviewed the spinal angiographic studies of 186 patients with spinal cord vascular malformations--70 intramedullary AVMs, 44 extra (peri) medullary AV fistulas, and 72 dural AV fistulas. RESULTS: Fifteen spinal artery aneurysms (SAs) in 14 out of 70 patients (20%) with an intramedullary AVM were discovered. No SAs were observed in the other types of spinal vascular malformations. The intramedullary AVMs with SAs were cervical in seven cases and thoracic in the other seven cases (one of the thoracic had two SAs). Fourteen SAs were located on a major feeding vessel to the associated intramedullary AVM (10 on the anterior spinal artery and four on a posterior spinal artery and only one SA was located remote from the AVM feeding vessels. This remote aneurysm was located on the intercostal artery feeding a vertebral angioma in a patient with metameric angiomatosis. Subarachnoid hemorrhage occurred in all cases of SA. The presence of a SA carried a statistically significant (P less than .05) increase in the risk of bleeding. CONCLUSIONS: Although increased blood flow seems to be an important factor in formation of these SAs associated with intramedullary AVMs, the role of a developmental vascular anomaly must be stressed: metameric angiomatosis was found in six out of the 14 patients (43%).

Adolescent↗
PubMedDate not supplied

Aneurysms of spinal arteries associated with intramedullary arteriovenous malformations. II. Results of AVM endovascular treatment and hemodynamic considerations.

PURPOSE: To evaluate the changes occurring in spinal aneurysm (SA) size related to modification of endovascularly treated AVMs. METHODS: Fourteen patients with an intramedullary AVM and associated SA underwent endovascular treatment of their AVM with particles. Embolization sessions numbered from one to 14 (mean five) in each patient. RESULTS: Four patients had SAs with size changes mirroring those of the AVM with embolization: these decreased in size or disappeared after AVM reduction or cure and increased or recurred after AVM recanalization. A second group of patients had SAs that remained unchanged despite AVM changes (six of seven of these were in patients with metameric angiomatosis). CONCLUSIONS: Results in the first group lend support to the hemodynamic theory of associated aneurysm formation. On the other hand, aneurysms that remained unchanged probably are not AVM flow-related and could be an expression of an extensive vascular disorder such as metameric angiomatosis; however, hemodynamic and developmental factors could be concurrent.

Aneurysm↗
PubMedDate not supplied

Embolization of arteriovenous malformations of the temporal lobe via the anterior choroidal artery.

The indications, technique, and results of embolization of arteriovenous malformations with liquid adhesive agents delivered through the anterior choroidal artery are reported. Arteriovenous malformations of the temporal lobe were found in four patients with intracerebral bleeding and two with intractable epilepsy. In five of the six, the dominant arterial feeder was the anterior choroidal artery. All patients underwent superselective catheterization of the anterior choroidal artery and embolization of the arteriovenous malformation. Complications related to the anterior choroidal artery embolization developed after embolization in one patient, after which we changed our technique of embolizing arteriovenous malformations via this artery. A thorough understanding of the functional anatomic structures supplied by each segment of the artery is important. Guidelines for safe catheterization and embolization are given. Embolization of arteriovenous malformations fed predominantly by the anterior choroidal artery is difficult and dangerous. An understanding of the functional anatomy of this artery and proper technique can enable successful embolization of arteriovenous malformations via this route.

Adolescent↗
PubMedDate not supplied

Classification of spinal cord vascular malformations.

Through the aid of developments in the neuroradiological sciences, great attention has been given to the diagnosis and treatment of vascular malformations of the spinal cord. Some of these are congenital, such as intramedullary vascular malformations and arteriovenous fistulae supplied by the spinal cord. Others are rather frequent and appear in old age. Due to their poor prognosis when not treated, precise determinations and sufficient knowledge are of the utmost importance.

Aged↗
PubMedDate not supplied

The use of detachable balloons in neuroradiology.

The development of the detachable balloon allows treatment of many neurological lesions, both congenital and acquired. We describe here a device that may be used easily. Complications and main indications are discussed on the basis of our experience with 114 cases.

Adult↗
PubMedDate not supplied

MR manifestations of subependymomas.

PURPOSE: To provide a description of the MR and enhanced MR appearances of subependymomas. METHODS: We reviewed the MR examinations of eight cases of pathologically proved subependymomas and correlated them with operative and pathologic reports, and also reviewed the previous published cases of subependymomas documented by MR. Gadopentetate dimeglumine-enhanced MR examination was performed in seven cases. RESULTS: One patient presented with four subependymomas, two patients had subependymomas of the cervical spine, and the others were intraventricular with no transependymal extension. They were isointense to hypointense relative to normal white matter on T1-weighted images, heterogeneous in five cases. Minimal (n = 1) or no (n = 3) enhancement was noted in four cases, and moderate or marked enhancement was noted in three cases. CONCLUSION: We conclude that even though there is no specific sign of subependymomas, when confronted with a complete intraventricular lesion or with a spinal lesion causing little or no edema which is minimally enhancing or nonenhancing, one must consider the diagnosis of subependymoma.

Adolescent↗