Evaluation of Craniometric Parameters and Efficacy of Posterior Surgical Intervention Types in Basilar Invagination Patients.

Objective: Basilar invagination is one of the most frequently observed abnormalities at the craniovertebral junction, in which the odontoid process of C2 prolapses into the foramen magnum.

Methods: The current study included 27 patients who underwent surgery for basilar invagination between October 2013 and January 2023. The study group was divided into 2 groups according to basilar invagination types; type I (the presence of type A atlantoaxial instability and instability is the main pathology) and type II (the presence of type B and C atlantoaxial instability and skull base dysgenesis is the main pathology).

Predicting the probability of meningioma recurrence in the preoperative and early postoperative period: a multivariate analysis in the midterm follow-up.

We reviewed the clinical, radiological, surgical, and histopathological features of patients with meningiomas to identify factors that can predict tumor recurrence after "microscopic total removal," to improve preoperative surgical planning, and to help determine the need for close radiological observation at shorter intervals or the need for radiotherapy as an adjuvant treatment in the early postoperative period. Clinical data, magnetic resonance imaging studies, angiographic data, operative reports, and histopathological findings were examined retrospectively in 137 patients with a meningioma treated microsurgically and with no evidence of residual tumor on postoperative MR images. Based on univariate analysis, tumor size, a mushroom shape, proximity to major sinuses, edema, osteolysis, cortical penetration, signal intensity on T2-weighted MRIs, pial-cortical arterial supply, presence of a brain-tumor interface in surgery, Simpson's criteria, and histopathological classification were significant predictors for recurrence.

Chondromas of the falx cerebri and dural convexity: report of two cases and review of the literature.

Intracranial chondromas usually arise from the base of the skull. They rarely originate from the convexity dura and falx. Here we describe two cases of intracranial chondroma located at the convexity dura and falx, discuss the genesis, radiologic, histologic features and review the literature.

Congenital peripheral facial palsy associated with cerebellopontine angle arachnoid cyst.

Objects: A rare case of cerebellopontine angle arachnoid cyst leading to congenital peripheral facial palsy was presented.

Clinical Presentation: A 1-year-old girl presented with peripheral facial paralysis since birth. Computed tomography and magnetic resonance imaging revealed left cerebellopontine angle arachnoid cyst causing moderate displacement of the brain stem.

Risk factors for surgical site infections in neurosurgery patients with antibiotic prophylaxis.

Background: This prospective study aimed to determine the spectrum and the main risk factors of surgical site infection (SSI) after neurosurgical procedures in our clinic.

Methods: Consecutive patients undergoing neurosurgery between November 1, 2001, and November 1, 2002, were recruited for the study. All patients were followed for a minimum of 2 weeks postoperatively and all SSIs were recorded.

Effect of neutralization of rat IL-6 bioactivity on collateral blood supply from retrograde flow via cortical anastomoses in the rat central nervous system.

The purpose of this study was to determine whether neutralization of rat interleukin-6 (IL-6) bioactivity increases the collateral blood supply from retrograde flow via the major middle cerebral artery branches after experimental middle cerebral artery occlusion in the rat. Seventy rats were randomly allocated to four main groups: Group I (n = 10) consisted of normal controls; Group II (n = 20) underwent craniectomy only; Group III (n = 20) was subjected to middle cerebral artery occlusion; and Group IV (n = 20) underwent middle cerebral artery occlusion and treatment with anti-rat IL-6 antibody. Half of the rats from each of Groups II, III and IV were killed at 24 h and the other half at 72 h after craniectomy alone or occlusion.

Prognosis and prognostic factors in nonaneurysmal perimesencephalic hemorrhage: a follow-up study in 29 patients.

Background: Perimesencephalic nonaneurysmal hemorrhage is a benign form of subarachnoid hemorrhage with a low risk of rebleeding. The authors conducted a retrospective study to investigate the prognosis, possible prognostic factors, and long-term natural history in perimesencephalic nonaneurysmal subarachnoid hemorrhage (PNSH).

Methods: This report contains a retrospective analysis of 29 patients with PNSH who were followed from 1 month to 8 years with an average follow-up period of 5.

The relationships among ultrastructural angiogenic features, Na+ K+, Ca+2, Mg+2 ATP-ase activities and SOD concentration in the microvasculature of intracranial meningiomas and glial tumors.

The purpose of this study was to investigate the relationship among ultrastructural angiogenic features, adenosine-5'-triphosphatase (ATP-ase) activities and superoxide dismutase (SOD) concentration in the microvasculature of intracranial meningiomas and glial tumors. We examined 20 tumor materials from 20 adult patients with intracranial meningioma or glial tumor who underwent selective surgery, dividing them into two groups based on the type of the tumors. Group I consisted of 10 meningioma-materials, and Group II of 10 glial tumor-materials.

Prognosis and prognostic factors for unexplained subarachnoid hemorrhage: review of 84 cases.

Objective: We conducted a retrospective study to investigate the prognosis, possible prognostic factors, and long-term natural history of subarachnoid hemorrhage of unexplained cause.

Methods: This report contains a retrospective analysis of data for 84 patients with subarachnoid hemorrhage of unknown cause who were monitored for 1 month to 9.5 years, with an average follow-up period of 5.