[Ophthalmic artery aneurysms].

Introduction: Ophthalmic artery aneurysms are infrequent lesions and they have very specific particularities.

Objective: to present the anatomoclinical and surgical characteristic of our patients with ophthalmic aneurysms and to analyze our surgical results.

Patient And Methods: 604 patients with intracranial aneurysms were operated on between January 1982 and December 2004.

[Modes of treatment for arteriovenous malformations of the brain].

Introduction And Development: Over the years new kinds of therapy have been incorporated into the treatment of arteriovenous malformations (AVM). Current treatment of AVM of the brain employs three well established options: radiosurgery, endovascular therapy (embolisation) and microsurgical resection. Radiosurgery is the simplest and least invasive, but 2 3 years are required to achieve total obliteration, and throughout this time there is the risk of bleeding; its use is limited to small AVM.

[The diagnosis of arteriovenous malformations of the brain].

Introduction: Arteriovenous malformations (AVM) of the brain are, at present, entities that are difficult to diagnose owing to the variations in their clinical presentation and the different localisations in the central nervous system. Their most frequent clinical forms are haemorrhage, which is typically located in the intraparenchymatous region, seizures and, less frequently, vascular headache and progressive neurological deficit.

Development And Conclusions: Several imaging studies with different resolutions must be performed for a final and conclusive diagnosis of an AVM, and brain angiography remains the first choice procedure, both in diagnosis and in planning management.

[Subthalamic nucleus targeting and spatial variability].

Aim: The effectiveness of anatomic localization of the subthalamic nucleus (EAL) was assessed and the mapping method is described here. The symmetry of contralateral nuclei (SCN) was analyzed on 11 parkinsonian patients submitted to bilateral subthalamotomy with ablative lesioning.

Patients And Methods: To assess EAL the percentage so much of first trajectory (p1) as the total of trajectories (pt) that hit the target and the rest of subthalamic nucleus average distance (d) was calculated.

[Distal anterior cerebral artery aneurysms surgery].

Introduction: Distal anterior cerebral artery is the portion of the anterior cerebral artery located distal to the anterior communicating artery. Aneurysms of that territory represent 0.35 - 4.

[Aneurysms surgery in the patients aged seventy to eighty years].

Elderly patients are a growing population group in developing countries because of optimal health care. 13% of Cuba population is older than sixty years and it is expected to grow to 20% in 2005. Subarachnoid hemorrhage secondary to ruptured aneurysms in geriatric patients carries a high mortality but a few patients are selected for surgical treatment.

[Ogilvie's syndrome. A report of 3 cases].

Introduction: Lumbar spine surgery represents a common procedure in Neurosurgery. Ogilvie's Syndrome is an infrequent complication of lumbar disc surgery, characterized by acute paralytic ileum as a result of acute colonic dilatation without mechanical obstruction.

Clinical Cases: We present the clinical data, surgical findings and evolution of three patients operated on for large lumbar disc herniation.