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  • Author: Mladen E. Ovcharov x
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Basic Neuronavigation Options for Cortical and Subcortical Brain Lesions Surgery

Summary

Craniometric points are essential for orienting neurosurgeons in their practice. Understanding the correlations of these points help to manage any pathological lesion located on the cortical surface and subcortically. The brain sulci and gyri should be identified before craniotomy. It is difficult to identify these anatomical structures intraoperatively (after craniotomy) with precision. The main purpose of this study was to collect as much information as possible from the literature and our clinical practice in order to facilitate the placement of craniotomies without using modern neuronavigation systems. Operative reports from the last five years on cranial operations for cortical and subcortical lesions were reviewed. All the craniotomies had been planned, using four methods: detection of craniometric points, computed tomography (CT) scans/topograms, magnetic resonance imaging (MRI) scans/topograms, and intraoperative real-time ultrasonography (USG). Retrospectively, we analyzed 295 cranial operations. Our analysis showed that operating on for cortical lesions, we had frequently used the first and the second method mentioned above (118 patients), while in cases of subcortical lesions, we had used craniometric points, MRI scans/topograms and intraoperative real-time USG as methods of neuronavigation (177 patients). These results show that craniometric points are essential in both neurosurgical procedures.

Open access
A Rare Case of Subtentorial Arterio-Venous Malformation Case Report

Summary

The majority - over 80%, of arteriovenous malformations (AVMs) are supratentorial. The infratentorial AVM are uncommon and different from other intracranial AVMs in terms of history, diagnosis, treatment, prognosis, and follow up. The authors present a case of an intracranial hemorrhage, caused by rupture of an AVM in the posterior cranial fossa. Native (unenhanced) CT and computed tomography angiography (CTA) images of this rare location of AVM are presented.

Open access
Recurrence Rate of Lumbar Disc Herniation After Standard Discectomy and Microdiscectomy: A 5-Year Study

Summary

Lumbar disc herniation (LDH) is the most common pathology in young people, as well as people of active age. Despite sophisticated and new minimally invasive surgical techniques and approaches, reoperations for recurrent lumbar disc herniation (rLDH) could not be avoided. LDH recurrence rates, reported in different studies, range from 5 to 25%. The purpose of this study was to estimate the recurrence rates of LDH after standard discectomy (SD) and microdiscectomy (MD), and compare them to those reported in the literature. Retrospectively, operative reports for the period 2012-2017 were reviewed on LDH surgeries performed at the Neurosurgery Clinic of Dr Georgi Stranski University Hospital in Pleven. Five hundred eighty-nine single-level lumbar discectomies were performed by one neurosurgeon. The diagnoses of recurrent disc herniation were based on the development of new symptoms and magnetic resonance/computed tomography (MRI/CT) images showing compatible lesions in the same lumbar level as the primary lumbar discectomies. The recurrence rate was determined by using chi-square tests and directional measures. SD was the most common procedure (498 patients) followed by MD (91 patients). The cumulative reoperation rate for rLDH was 7.5%. From a total number of reoperations, 26 were males (59.1%) and 18 were females (40.9%). Reoperation rates were 7.6% and 6.6% after SD and MD respectively. The recurrence rate was not significantly higher for SD. Our recurrence rate was 7.5%, which makes it comparable with the rates of 5-25% reported in the literature.

Open access