Management of an intrathecal baclofen pump pocket empyema caused by a proximal vesicocutaneous fistula: A case report.

Background: Intrathecal baclofen infusing pumps are nowadays commonly implanted in patients suffering from severe, intractable spasticity with a background of multiple sclerosis. Although intrathecal baclofen therapy is considered a safe therapeutic modality, complications are unavoidable and broadly categorized as mechanical and infectious. In the instance of a pump pocket infection, a surgical explanation of the pump is often necessary to treat the infection. Case Description: We present the rare case of a 60-year-old woman who was admitted emergently to our clinic with a subcutaneous pump pocket empyema caused by proximal vesicocutaneous fistulas. The patient underwent explantation of the pump and otherwise had an uncomplicated perioperative course. Conclusion: The surgical explanation of the baclofen pump and antibiotic treatment were sufficient to treat the pump pocket empyema in this instance. To the best of our knowledge, this is the first report of a pump pocket empyema formed in the proximity of a vesicocutaneous fistula.

Hemorrhagic complications after removal of an external ventricular drain: A case report and literature review.

Background: External ventricular drainage (EVD) is one of the most common neurosurgical procedures. Complications are rather rare and mostly include hemorrhage and infection. Hematomas may form during placement or even after the removal of an EVD. Regarding the latter, the literature is scarce, with only nine clinically significant cases reported. Case Description: We present the case of a young woman who suffered an extensive hemorrhage after removal of an EVD, in the setting of a posterior fossa stroke. We discuss the management and possible consequences of such an event and we emphasize the need for alertness to avoid such complications. Conclusion: Removal of an EVD is a safe procedure, with rare cases of hemorrhagic complications being reported. A case of a large hematoma that formed after the removal of an EVD is presented. Stricter follow-up protocols should be implemented to better estimate the risk of hemorrhage.

mTOR pathway - a potential therapeutic target in stroke.

Stroke is ranked as the second leading cause of death worldwide and a major cause of long-term disability. A potential therapeutic target that could offer favorable outcomes in stroke is the mammalian target of rapamycin (mTOR) pathway. mTOR is a serine/threonine kinase that composes two protein complexes, mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2), and is regulated by other proteins such as the tuberous sclerosis complex. Through a significant number of signaling pathways, the mTOR pathway can modulate the processes of post-ischemic inflammation and autophagy, both of which play an integral part in the pathophysiological cascade of stroke. Promoting or inhibiting such processes under ischemic conditions can lead to apoptosis or instead sustained viability of neurons. The purpose of this review is to examine the pathophysiological role of mTOR in acute ischemic stroke, while highlighting promising neuroprotective agents such as hamartin for therapeutic modulation of this pathway. The therapeutic potential of mTOR is also discussed, with emphasis on implicated molecules and pathway steps that warrant further elucidation in order for their neuroprotective properties to be efficiently tested in future clinical trials.

Transient Intraluminal Filament Middle Cerebral Artery Occlusion Stroke Model in Rats: A Step-by-Step Guide and Technical Considerations.

OBJECTIVE: Stroke is a leading cause of disability and mortality worldwide. Related research, although already providing significant insights regarding the underlying pathophysiology and potential treatment strategies, has been far from conclusive. Stroke models have been proved of extreme significance for laboratories around the world. In the present report, we have described in detail the most popular to date focal stroke model, the transient intraluminal filament middle cerebral artery occlusion (tifMCAO) model in rats. This model reliably mimics stroke in humans and also approximates endovascular thrombectomy. METHODS: The tifMCAO model was performed using Wistar rats weighing 300-400 g. We have described the surgical technique in a stepwise manner, with figures and/or high-definition video provided for each step. We have also introduced the use of complete arteriotomy of the external carotid artery stump during the procedure. RESULTS: We performed tifMCAO in 65 rats (male and female) involved in various experimental protocols. Although the initial mortality was 48%, practice reduced the rate to 10%. The mean procedural time was 53 minutes (range, 38-85 minutes). In a group of 8 rats ischemia was confirmed in 7 of them, with the stroke induction rate being 87.5%. CONCLUSIONS: The tifMCAO stroke model in rats is the most often used experimental model of focal ischemia because of its clinical relevance. We revisited the procedure and divided it, for instructional purposes, into 15 consecutive and distinct steps.

A Brief Review of Brain's Blood Flow-Metabolism Coupling and Pressure Autoregulation.

BACKGROUND: The human brain, depending on aerobic glycolysis to cover its metabolic needs and having no energy reserves whatsoever, relies on a constant and closely regulated blood supply to maintain its structural and functional integrity. Cerebral autoregulation, that is, the brain's intrinsic ability to regulate its own blood flow independently from the systemic blood pressure and cardiac output, is an important physiological mechanism that offers protection from hypoperfusion injury. DISCUSSION: Two major independent mechanisms are known to be involved in cerebral autoregulation: (1) flow-metabolism coupling and (2) myogenic responses of cerebral blood vessels to changes in transmural/arterial pressure. A third, less prominent component of cerebral autoregulation comes in the form of neurogenic influences on cerebral vasculature. CONCLUSION: Although fragmentation of cerebral autoregulation in separate and distinct from each other mechanisms is somewhat arbitrary, such a scheme is useful for reasons of simplification and to better understand their overall effect. Comprehension of cerebral autoregulation is imperative for clinicians in order for them to mitigate consequences of its impairment in the context of traumatic brain injury, subarachnoid hemorrhage, stroke, or other pathological conditions.

The Potential Role of Carbon Nanoparticles in Lymph Node Tracing, Recurrent Laryngeal Nerve Identification and Parathyroid Preservation During Thyroid Surgery: A Systematic Review.

BACKGROUND/OBJECTIVE: Carbon nanoparticles (CNs) are a novel injected suspension used during thyroidectomy in order to black stain the thyroid gland and the lymph nodes while maintaining the anatomic color of the parathyroid glands and the laryngeal nerves. The aim of this systematic review is to investigate the benefits of carbon nanoparticles in thyroid surgical procedures and examine their role in lymph node tracing, parathyroid preservation, and recurrent laryngeal nerve protection. METHODS: A systematic review of the literature in the PubMed/Medline database was performed. Articles reporting randomized clinical trials, prospective, and retrospective studies that compared the use of carbon nanoparticles in one group of patients with a control-blank group were included. The article was reported in accordance with PRISMA guidelines (CRD42021243015). RESULTS: The search strategy retrieved 22 studies of the literature. Fourteen studies calculated a greater number of lymph nodes detected/dissected in the central neck zone to the patients using CN solution and 1 article noted a higher rate of lymph nodes resected in the lateral neck zone in the same group of patients. A significant increase in the number of metastatic lymph nodes retrieved in the CN group was found in 7 studies. Twenty-one studies suggested that the use of CNs for the protection of the parathyroid glands was beneficial. Transient hypoparathyroidism and transient hypocalcemia were presented with a significantly lower incidence in the CN group in 13 and in 8 studies, respectively. CONCLUSION: Carbon nanoparticles may improve both central and lateral neck dissection and enhance parathyroid gland identification and preservation.

Anterior Cervical Discectomy and Fusion combined with thyroid gland surgery, a tailored case and literature review.

BACKGROUND: Nowadays, Anterior Cervical Discectomy and Fusion (ACDF) is considered a routine procedure. However, unexpected difficulties do occasionally arise, especially when anterior neck pathologies or anatomical variations are encountered. In such cases, proactive thinking will allow surgeons to tailor appropriately their approach and eliminate surgical risks. CASE PRESENTATION: We present the case of a 50-year-old male patient suffering from left upper limb radiculopathy that underwent a C7-T1 ACDF combined with a hemithyroidectomy. Excision of the right thyroid lobe was offered to the patient because of a goiter found during the preoperative work-up. Furthermore, the hemithyroidectomy provided a wide surgical field so the ACDF performed without excreting excessive traction to the adjacent neck structures. CONCLUSIONS: The patient had an uncomplicated post-operative. To our knowledge this is the first report of a planned hemithyroidectomy being carried out as the first step towards an ACDF procedure.

Spinal synovial cysts. A case series and current treatment options.

Synovial cysts constitute an uncommon degenerative lesion of the spine. They are usually asymptomatic but they may also cause symptoms of variable severity. The authors present three cases of such cysts, two in the lumbar region of a 55-year-old female and a 66 year old female and one in the cervical region of a 56-year-old male patient. All patients presented with radiculopathy. Magnetic Resonance Images revealed a cystic lesion at the L4/5 level in the first case, at L5/S1 level in the second case and at the C7/T1 junction level in the third case. Treatment has been microsurgical resection of all cysts with no post-operative complications and an excellent outcome. A discussion of current management options for this unusual disease is presented and a decision making flow chart is proposed.

Current trends in the surgical management of blister aneurysms. An illustrative case series.

Blister aneurysms are rare lesions characterized by a bleb-like appearance in combination with prominent fragility. They mainly affect the supraclinoid internal carotid artery and they are often thought of as dissecting or even false lesions. Treatment of such lesions has been a matter of debate during the past few years with authors competing, in an ever changing field, for best results. Both surgical and endovascular modalities have been tried, with every technique having though its own limitations and pitfalls. Our article presents a small series of five blister cases, all treated by surgical means (clipping). We also review the relevant literature presenting a brief overview of available surgical options.

The cerebral isthmus: fiber tract anatomy, functional significance, and surgical considerations.

OBJECTIVE: The cerebral isthmus is the white matter area located between the periinsular sulcus and the lateral ventricle. Studies demonstrating the fiber tract and topographic anatomy of this entity are lacking in current neurosurgical literature. Hence, the authors' primary aim was to describe the microsurgical white matter anatomy of the cerebral isthmus by using the fiber dissection technique, and they discuss its functional significance. In addition, they sought to investigate its possible surgical utility in approaching lesions located in or adjacent to the lateral ventricle. METHODS: This study was divided into 2 parts and included 30 formalin-fixed cerebral hemispheres, 5 of which were injected with colored silicone. In the first part, 15 uncolored specimens underwent the Klinger's procedure and were dissected in a lateromedial direction at the level of the superior, inferior, and anterior isthmuses, and 10 were used for coronal and axial cuts. In the second part, the injected specimens were used to investigate the surgical significance of the superior isthmus in accessing the frontal horn of the lateral ventricle. RESULTS: The microsurgical anatomy of the anterior, superior, and inferior cerebral isthmuses was carefully studied and recorded both in terms of topographic and fiber tract anatomy. In addition, the potential role of the proximal part of the superior isthmus as an alternative safe surgical corridor to the anterior part of the lateral ventricle was investigated. CONCLUSIONS: Using the fiber dissection technique along with coronal and axial cuts in cadaveric brain specimens remains a cornerstone in the acquisition of thorough anatomical knowledge of narrow white matter areas such as the cerebral isthmus. The surgical significance of the superior isthmus in approaching the frontal horn of the lateral ventricle is stressed, but further studies must be carried out to elucidate its role in ventricular surgery.