Onyx Embolization of a Distal Middle Cerebral Artery Pseudoaneurysm in a Five-Week-Old: A Case Report and Review of Current Treatment Options.

Intracranial pseudoaneurysms secondary to traumatic birth are a rare finding in infants. Definitive diagnosis of such findings is challenging, and no standard management is delineated for management of pseudoaneurysms in the pediatric population. Commonly attempted treatments include endovascular embolization or surgical clipping. A 5-week-old female presented with a two day history of right hand focal seizures. The patient was found to have a dysplastic superficial intra-axial aneurysm arising from the distal left middle cerebral artery (MCA) branch in the setting of a left posterior frontal lobe hemorrhage noted on brain magnetic resonance imaging/magnetic resonance angiography (MRI/MRA). The patient underwent diagnostic cerebral angiogram demonstrating a left distal MCA pseudoaneurysm, which was treated with Onyx embolization. Post-embolization period was complicated by recurrent left central localized seizures and a left hemispheric temporoparietal hemorrhagic infarction. The patient was managed on levetiracetam, phenytoin, phenobarbital with stable seizure control. Herein, we highlight the youngest case to date of a 5-week-old infant with a left distal MCA pseudoaneurysm treated with Onyx embolization. Pseudoaneurysmal incidence, diagnosis and accepted management is discussed.

Impact of Balloon Guide Catheter Use on Clinical and Angiographic Outcomes in the STRATIS Stroke Thrombectomy Registry.

Background and Purpose- Mechanical thrombectomy has been shown to improve clinical outcomes in patients with acute ischemic stroke. However, the impact of balloon guide catheter (BGC) use is not well established. Methods- STRATIS (Systematic Evaluation of Patients Treated With Neurothrombectomy Devices for Acute Ischemic Stroke) was a prospective, multicenter study of patients with large vessel occlusion treated with the Solitaire stent retriever as first-line therapy. In this study, an independent core laboratory, blinded to the clinical outcomes, reviewed all procedures and angiographic data to classify procedural technique, target clot location, recanalization after each pass, and determine the number of stent retriever passes. The primary clinical end point was functional independence (modified Rankin Scale, 0-2) at 3 months as determined on-site, and the angiographic end point was first-pass effect (FPE) success rate from a single device attempt (modified Thrombolysis in Cerebral Infarction, ≥2c) as determined by a core laboratory. Achieving modified FPE (modified Thrombolysis in Cerebral Infarction, ≥2b) was also assessed. Comparisons of clinical outcomes were made between groups and adjusted for baseline and procedural characteristics. All participating centers received institutional review board approval from their respective institutions. Results- Adjunctive technique groups included BGC (n=445), distal access catheter (n=238), and conventional guide catheter (n=62). The BGC group had a higher rate of FPE following first pass (212/443 [48%]) versus conventional guide catheter (16/62 [26%]; P=0.001) and distal access catheter (83/235 [35%]; P=0.002). Similarly, the BGC group had a higher rate of modified FPE (294/443 [66%]) versus conventional guide catheter (26/62 [42%]; P<0.001) and distal access catheter (129/234 [55%]; P=0.003). The BGC group achieved the highest rate of functional independence (253/415 [61%]) versus conventional guide catheter (23/55 [42%]; P=0.007) and distal access catheter (113/218 [52%]; P=0.027). Final revascularization and mortality rates did not differ across the groups. Conclusions- BGC use was an independent predictor of FPE, modified FPE, and functional independence, suggesting that its routine use may improve the rates of early revascularization success and good clinical outcomes. Clinical Trial Registration- URL: https://www.clinicaltrials.gov . Unique identifier: NCT02239640.

Interhospital Transfer Before Thrombectomy Is Associated With Delayed Treatment and Worse Outcome in the STRATIS Registry (Systematic Evaluation of Patients Treated With Neurothrombectomy Devices for Acute Ischemic Stroke).

BACKGROUND: Endovascular treatment with mechanical thrombectomy (MT) is beneficial for patients with acute stroke suffering a large-vessel occlusion, although treatment efficacy is highly time-dependent. We hypothesized that interhospital transfer to endovascular-capable centers would result in treatment delays and worse clinical outcomes compared with direct presentation. METHODS: STRATIS (Systematic Evaluation of Patients Treated With Neurothrombectomy Devices for Acute Ischemic Stroke) was a prospective, multicenter, observational, single-arm study of real-world MT for acute stroke because of anterior-circulation large-vessel occlusion performed at 55 sites over 2 years, including 1000 patients with severe stroke and treated within 8 hours. Patients underwent MT with or without intravenous tissue plasminogen activator and were admitted to endovascular-capable centers via either interhospital transfer or direct presentation. The primary clinical outcome was functional independence (modified Rankin Score 0-2) at 90 days. We assessed (1) real-world time metrics of stroke care delivery, (2) outcome differences between direct and transfer patients undergoing MT, and (3) the potential impact of local hospital bypass. RESULTS: A total of 984 patients were analyzed. Median onset-to-revascularization time was 202.0 minutes for direct versus 311.5 minutes for transfer patients (P<0.001). Clinical outcomes were better in the direct group, with 60.0% (299/498) achieving functional independence compared with 52.2% (213/408) in the transfer group (odds ratio, 1.38; 95% confidence interval, 1.06-1.79; P=0.02). Likewise, excellent outcome (modified Rankin Score 0-1) was achieved in 47.4% (236/498) of direct patients versus 38.0% (155/408) of transfer patients (odds ratio, 1.47; 95% confidence interval, 1.13-1.92; P=0.005). Mortality did not differ between the 2 groups (15.1% for direct, 13.7% for transfer; P=0.55). Intravenous tissue plasminogen activator did not impact outcomes. Hypothetical bypass modeling for all transferred patients suggested that intravenous tissue plasminogen activator would be delayed by 12 minutes, but MT would be performed 91 minutes sooner if patients were routed directly to endovascular-capable centers. If bypass is limited to a 20-mile radius from onset, then intravenous tissue plasminogen activator would be delayed by 7 minutes and MT performed 94 minutes earlier. CONCLUSIONS: In this large, real-world study, interhospital transfer was associated with significant treatment delays and lower chance of good outcome. Strategies to facilitate more rapid identification of large-vessel occlusion and direct routing to endovascular-capable centers for patients with severe stroke may improve outcomes. CLINICAL TRIAL REGISTRATION: URL: https://www.clinicaltrials.gov. Unique identifier: NCT02239640.

Systematic Evaluation of Patients Treated With Neurothrombectomy Devices for Acute Ischemic Stroke: Primary Results of the STRATIS Registry.

BACKGROUND AND PURPOSE: Mechanical thrombectomy with stent retrievers has become standard of care for treatment of acute ischemic stroke patients because of large vessel occlusion. The STRATIS registry (Systematic Evaluation of Patients Treated With Neurothrombectomy Devices for Acute Ischemic Stroke) aimed to assess whether similar process timelines, technical, and functional outcomes could be achieved in a large real world cohort as in the randomized trials. METHODS: STRATIS was designed to prospectively enroll patients treated in the United States with a Solitaire Revascularization Device and Mindframe Capture Low Profile Revascularization Device within 8 hours from symptom onset. The STRATIS cohort was compared with the interventional cohort of a previously published SEER patient-level meta-analysis. RESULTS: A total of 984 patients treated at 55 sites were analyzed. The mean National Institutes of Health Stroke Scale score was 17.3. Intravenous tissue-type plasminogen activator was administered in 64.0%. The median time from onset to arrival in the enrolling hospital, door to puncture, and puncture to reperfusion were 138, 72, and 36 minutes, respectively. The Core lab-adjudicated modified Thrombolysis in Cerebral Infarction ≥2b was achieved in 87.9% of patients. At 90 days, 56.5% achieved a modified Rankin Scale score of 0 to 2, all-cause mortality was 14.4%, and 1.4% suffered a symptomatic intracranial hemorrhage. The median time from emergency medical services scene arrival to puncture was 152 minutes, and each hour delay in this interval was associated with a 5.5% absolute decline in the likelihood of achieving modified Rankin Scale score 0 to 2. CONCLUSIONS: This largest-to-date Solitaire registry documents that the results of the randomized trials can be reproduced in the community. The decrease of clinical benefit over time warrants optimization of the system of care. CLINICAL TRIAL REGISTRATION: URL: http://www.clinicaltrials.gov. Unique identifier: NCT02239640.

Minimally invasive approach for the treatment of intradural spinal pathology.

OBJECT: A wide variety of spinal intradural pathology traditionally has been treated from a midline posterior laminectomy using standard microsurgical techniques. This approach has been successful in treating the pathology; however, it carries a risk of postoperative complications including CSF leakage, wound infection, and spinal instability. The authors describe a minimally invasive surgical (MIS) approach to treating spinal intradural pathology with a low rate of postoperative complications. METHODS: Through a retrospective review of a prospectively collected surgical database, the authors identified 26 patients who underwent 27 surgeries via an MIS approach for intradural pathology of the spine. Using a tubular retractor system and an operative microscope, the authors were able to treat all patients with a unilateral, paramedian, and muscle-splitting technique. They then collected data regarding operative blood loss, length of stay, imaging characteristics, and outcomes. RESULTS: Eight cervical, 8 thoracic, and 11 lumbar intradural pathological entities, which included 14 oncological lesions, 4 Chiari I malformations, 4 arachnoid cysts, 3 tethered cords, 1 syrinx, and 1 chronic visceral pain, were treated via an MIS approach. The average blood loss was 197 ml and the average hospital stay was 3 days. One patient had to return to the operating room for noninfectious wound dehiscence. One patient required reoperation 18 months after the initial surgery for recurrence of the initial pathology. There was no CSF leak, no infection, and no spinal instability associated with the initial surgery on follow-up. CONCLUSIONS: Intradural spinal pathology can be safely and effectively treated with MIS approaches without an increased risk of neurological injury. This approach may also offer a reduced postoperative length of stay, risk of CSF leak, and risk of future spinal instability.

Cranial decompression for the treatment of malignant intracranial hypertension after ischemic cerebral infarction: decompressive craniectomy and hinge craniotomy.

OBJECT: Recent randomized trials have demonstrated a positive role (improved survival) in patients treated with cranial decompression for malignant cerebral infarction. However, many variables regarding operative decompression in this setting remain to be determined. Hinge craniotomy is an alternative to decompressive craniectomy, but its role in space-occupying cerebral infarctions has not been delineated. The objective of this study was to compare the authors' experiences with these 2 procedures in the management of space-occupying cerebral infarctions to determine the efficacy of each. METHODS: The authors conducted a retrospective review of 28 cases involving patients who underwent cranial decompression (hinge craniotomy in 9 cases, decompressive craniectomy in 19) for treatment of malignant intracranial hypertension after ischemic cerebral infarction. RESULTS: No significant differences were identified in baseline demographics, neurological examination, or Rotterdam score between the hinge craniotomy and decompressive craniectomy groups. Both treatments resulted in adequate control of intracranial pressure (ICP). The need for reoperation for persistent intracranial hypertension and duration of mechanical ventilation and intensive care unit stay were similar. Hospital survival was significantly higher in the decompressive craniectomy group (89% vs 56%), whereas long-term functional outcome was better in the hinge craniotomy group. Cranial defect size was comparable in the 2 groups. Postoperative imaging revealed a higher rate of subarachnoid hemorrhage, contusion/hematoma progression, and subdural effusions/hygromas after decompressive craniectomy. The requirement for cranial revision in survivors was higher for patients undergoing decompressive craniectomy (100%) than those undergoing hinge craniotomy (20%). CONCLUSIONS: Hinge craniotomy appears to be at least as good as decompressive craniectomy in providing postoperative ICP control at a similar therapeutic index. Although the in-hospital mortality was higher in patients treated with hinge craniotomy, that procedure resulted in superior long-term functional outcomes and may help limit postoperative complications.

Conservative management of ventriculoperitoneal shunts in the setting of abdominal and pelvic infections.

OBJECT: The optimal management of a ventriculoperitoneal shunt in the setting of acute, non-shunt related abdominal and pelvic infections is unknown. In the literature, distal shunt catheter reimplantation with or without a variable period of externalization has been recommended to prevent ascending ventriculitis. While this strategy is effective, there is little to almost no published data suggesting that it is necessary in all cases. Furthermore, it is not clear that shunt externalization to an external drainage bag during the treatment of non-shunt related peritonitis is any less likely to lead to ventriculitis than leaving the catheter in place. In the authors' experience, shunt externalization or revision during an episode of acute, non-shunt related peritonitis is unnecessary to prevent ventriculitis or chronic peritonitis. METHODS: In the present case series, the authors report on 7 patients whose shunts were left in the abdomen while they were treated for acute peritonitis. The patients were followed clinically for up to 21 months after the diagnosis to assess for evidence of recurrent abdominal infections, shunt infections, or shunt failure. RESULTS: In a follow-up period ranging from 13 to 22 months, no patient developed ventriculitis, required a shunt revision, or was unable to clear the peritoneal infection. CONCLUSIONS: The results of this small series suggest that leaving the distal end of a shunt catheter in place in a patient with acute peritonitis is a reasonably safe choice in specific patients, provided the source of infection is aggressively treated with systemic antibiotics and local debridement when necessary.

Intraventricular inflammatory pseudotumor: report of two cases and review of the literature.

Inflammatory pseudotumors (IP) are non-neoplastic lesions characterized by collagenous stroma and polyclonal mononuclear infiltrates. It is best characterized in the lung, but can occur in the CNS, mimicking a neoplastic process. We discuss the available literature and our cases in order to elucidate best medical practices when confronted with such a lesion. We report on two cases of intraventricular inflammatory pseudotumor in patients who presented with symptoms of CSF obstruction. Both patients were treated surgically with significant clinical improvement. Histopathologically, both specimens revealed a plasma cell granuloma variant of IP. A Medline search for English articles identified 46 cases of CNS IP, only eight of which were located within the ventricle. As with our case, most patients presented due to CSF obstruction or mass effect. Radiographically, the lesions have a variable appearance although most enhanced with gadolinium. Complete resection was achieved in 67% with a 12% rate of recurrence. With incomplete resection or biopsy alone, progression is seen despite steroid or radiation administration. Malignant transformation was only reported once. CNS IP is a rare pathological entity that cannot be diagnosed through clinical presentation or radiographic characteristics, but rather through a careful neuropathological inspection. The available literature suggests that complete resection with close follow-up is necessary.

A comparison of hinge craniotomy and decompressive craniectomy for the treatment of malignant intracranial hypertension: early clinical and radiographic analysis.

OBJECT: Hinge craniotomy (HC) has recently been described as an alternative to decompressive craniectomy (DC). Although HC may obviate the need for cranial reconstruction, an analysis comparing HC to DC has not yet been published. METHODS: A retrospective review was conducted of 50 patients who underwent cranial decompression (20 with HC, 30 with DC). Baseline demographics, neurological examination results, and underlying pathology were reviewed. Clinical outcome was assessed by length of ventilatory support, length of intensive care unit stay, and survival at discharge. Control of intracranial hypertension was assessed by average daily intracranial pressure (ICP) for the duration of ICP monitoring and an ICP therapeutic intensity index. Radiographic outcomes were assessed by comparing preoperative and postoperative CT scans for: 1) Rotterdam score; 2) postoperative volume of cerebral expansion; 3) presence of uncal herniation; 4) intracerebral hemorrhage; and 5) extraaxial hematoma. Postoperative CT scans were analyzed for the size of the craniotomy/craniectomy and magnitude of extracranial herniation. RESULTS: No significant differences were identified in baseline demographics, neurological examination results, or Rotterdam score between the HC and DC groups. Both HC and DC resulted in adequate control of ICP, as reflected in the average ICP for each group of patients (HC = 12.0 +/- 5.6 mm Hg, DC = 12.7 +/- 4.4 mm Hg; p > 0.05) at the same average therapeutic intensity index (HC = 1.2 +/- 0.3, DC = 1.2 +/- 0.4; p > 0.05). The need for reoperation (3 [15%] of 20 patients in the HC group, 3 [10%] of 30 patients in the DC group; p > 0.05), hospital survival (15 [75%] of 20 in the HC group, 21 [70%] of 30 in the DC group; p > 0.05), and mean duration of both mechanical ventilation (9.0 +/- 7.2 days in the HC group, 11.7 +/- 12.0 days in the DC group; p > 0.05) and intensive care unit stay (11.6 +/- 7.7 days in the HC group, 15.6 +/- 15.3 days in the DC group; p > 0.05) were similar. The difference in operative time for the two procedures was not statistically significant (130.4 +/- 71.9 minutes in the HC group, 124.9 +/- 63.3 minutes in the DC group; p > 0.05). The size of the cranial defect was comparable between the 2 groups. Postoperative imaging characteristics, including Rotterdam score, also did not differ significantly. Although a smaller volume of cerebral expansion was associated with HC (77.5 +/- 54.1 ml) than DC (105.1 +/- 65.1 ml), this difference was not statistically significant. CONCLUSIONS: Hinge craniotomy appears to be at least as good as DC in providing postoperative ICP control and results in equivalent early clinical outcomes.