Unruptured untreated intracranial aneurysms: a retrospective analysis of outcomes of 445 aneurysms managed conservatively.

BACKGROUND: Factors predicting the growth or rupture of unruptured intracranial aneurysms (UIAs) remain under debate. Increased availability of neuro-imaging has led to increasing incidental findings, therefore understanding the natural history is vital to make appropriate management and follow-up decisions. We analysed a large dataset of UIAs to better identify patients at increased risk, therefore requiring enhanced monitoring and/or prophylactic intervention. METHODS: Electronic patient records were reviewed from consecutive patients regarding the following data: baseline demographics; past medical and smoking history; indication for imaging detecting the UIA(s); size, location and morphology of UIA(s), duration of imaging follow-up, detection of growth and rupture. Logistic regression was used to identify risk factors for UIA growth or rupture. Subgroup analysis was performed for 'small' aneurysms (<7mm). RESULTS: 445 UIAs in 274 patients were analysed. Total imaging follow-up was 2268 aneurysm-years (median 3.8 years/UIA). 27 UIAs grew (1.2% annually), and 15 ruptured (0.46%). 70.1% of UIAs were detected incidentally. Mean aneurysm diameter was 4.1mm.Logistic regression identified age < 50, autosomal dominant polycystic kidney disease (ADPKD), hypertension and diameter > 7mm as significant risk factors for growth/rupture. Additionally, previous smoking compared to current smoking was a protective factor against growth or rupture, but no significant difference was seen when comparing current- with non-smokers. Small aneurysm subgroup analysis identified diameter > 5mm, age < 50, ADPKD, and ongoing smoking as risk factors. No significant difference was observed in risk between those with and without previous SAH. CONCLUSIONS: This study underlines the need for imaging surveillance of even small UIAs. Smoking is a modifiable risk factor for growth/rupture of pre-existing aneurysms, while ADPKD is a particularly strong risk factor.

Spinal paraganglioma presenting with raised intracranial pressure: a note on the diagnosis and post-operative management.

BACKGROUND: Spinal paragangliomas are tumors of neuroendocrine origin that present with symptoms of mass effect or neurosecretion but rarely involve the central nervous system. Raised intracranial pressure and papilledema are therefore unusual presentations of a spinal paraganglioma. METHODS: We review the case of a 54-year-old man who presented with headache and visual disturbance. Fundoscopy confirmed papilledema with normal intracranial imaging. Neuraxis imaging revealed a lumbar intradural extramedullary tumor and pathological analysis confirmed a WHO Grade I spinal paraganglioma. The tumor was resected and post operatively his vison improved with resolution of optic disc swelling. CONCLUSIONS: Raised intracranial pressure and papilledema are unusual clinical manifestations of spinal tumors and imaging the entire neuraxis can be valuable.

Fifteen-Year Institutional Retrospective Case Series of Decompressive Craniectomy for Malignant Middle Cerebral Artery Infarction.

OBJECTIVE: In the present study, we updated our previously reported case series of patients who had undergone decompressive craniectomy for malignant middle cerebral artery infarction (mMCAI) (2005-2020). To the best of our knowledge, the present case series constitutes the largest reported series from a UK neurosurgical unit of decompressive craniectomy for mMCAI. METHODS: We extracted data regarding the clinical discriminators, surgical timescales, and functional outcomes of patients. RESULTS: A total of 67 patients had undergone decompressive craniectomy. The 30-day mortality was 17.9% (n = 12). Of the 67 patients, 31 were male (46.3%) and 36 were female (53.7%). Their mean age was 45 years (range, 16-64 years). The mean age of the survivors was 43 years (range, 16-62 years) compared with 50 years (range, 38-64 years) for those who had died. The median ictal and preoperative Glasgow coma scale score was 14 (range, 7-15) and 8 (range, 3-15), respectively. The corresponding motor scores were 6 and 5. The mean interval from ictus to neurosurgical unit admission was 18.25 hours (range, 0.5-66 hours) and from admission to decompressive craniotomy was 7.30 hours (range, 0.5-46 hours). Of the 67 patients, 63% had undergone "early" craniectomy (<48 hours from mMCAI evolution), with 89% of these patients having undergone craniectomy <24 hours after neurosurgical unit admission. The mean maximum anteroposterior craniectomy diameter was 13.01 cm (range, 10.29-15.56 cm), and mean surface area was 94.38 cm2 (range, 74.75-132.32 cm2). Overall, 46% of patients had had a modified Rankin scale score of <3 (range, 0-6) from discharge to 12 months postoperatively. The median neurosurgical unit length of stay was 15 days (range, 6 hours to 365 days). CONCLUSIONS: The findings from the present update have confirmed that local practice has remained consistent with current evidence. However, patient selection might be optimized if diffusion-weighted magnetic resonance imaging and computed tomography perfusion were used at the original middle cerebral artery infarct admission.

10-Year Institutional Retrospective Case Series of Decompressive Craniectomy for Malignant Middle Cerebral Artery Infarction (mMCAI).

BACKGROUND: A 10-year (2005-2015) retrospective case series of patients undergoing decompressive craniectomy for malignant middle cerebral artery infarction (mMCAI) was undertaken. METHODS: Patient demographics, comorbidities, pre- and postoperative neurologic state, operative timescales, craniectomy dimensions, and Glasgow Outcome Scale scores were analyzed. RESULTS: Overall 40 patients underwent a decompressive craniectomy for mMCAI with a 30-day mortality of 17.5% (n = 7). Seventeen patients (42.5%) were male, with a mean age of 43 years (range: 16-64 years). Patients who survived had a lower mean age of 41 years (range: 16-59 years) than those who did not of 50 years (range: 42-63 years). The modal ictal and preoperative Glasgow Coma Scale scores were 14 (range: 5-15) and 7 (range: 3-12), which corresponded to motor scores of 6 and 5, respectively. The mean time from ictus to admission to the Institute of Neurological Sciences (INS) was 23.5 hours (range: 0.5-66 hours) and from INS admission to decompression 7.5 hours (range: 0.5-46 hours). Approximately 60% of patients had an "early" craniectomy (under 48 hours from ictus) and 60% of patients had a craniectomy performed less than 24 hours from INS admission. The mean maximum anteroposterior craniectomy diameter measured 13 cm (range: 10.93-15.12 cm) and the mean surface area was 92.68 cm2 (range: 76.14-124.42 cm2). Overall 80% of patients had a modal Glasgow Outcome Scale score of 3 (range: 2-5) at discharge, 3 months, 6 months, 9 months, and 12 months. The median length of stay was 3 days (range: 6 hours to 11 days) for nonsurvivors and 13 days (range: 1-365 days) for survivors. CONCLUSION: Decompressive craniectomy for mMCAI is suitable in selected patients, and the local practice is consistent with current evidence.

Comparative surgical outcome associated with the management of brain arteriovenous malformation in a regional neurosurgical centre.

OBJECTIVES: Microsurgical resection of brain arteriovenous malformation (AVMs) is challenging, however, expert surgical series from large volume centres, have reported over 95% occlusion rates with 2 to 8% risk of morbidity & mortality. Data from a regional neurosurgical unit was analysed and compared with published series for the purposes of quality control. We also compared our surgical result with other treatment modalities from the whole AVM cohort managed over the same study period. DESIGN: Retrospective analysis of a locally held AVM database. SUBJECTS: Of the 141 AVM patients, 54 (35M, 19F, age range 9-68 years) underwent microsurgical removal of AVM by the senior author, from 2006 to 2012. 27 (19%), 18 (13%), 20 (14%), 22 (16%) had endovascular therapy only, radiosurgery only, combination therapy (endovascular and radiosurgery) and conservative management, respectively. METHODS: Case notes were reviewed to determine clinical and radiological outcomes. Statistical analysis performed using SPSS with p < 0.05 defined as statistical significance. RESULTS: In the surgical series, the Spetzler-Martin (SM) grade distribution was as follows: 17 grade I (32%), 31 grade II (57%), and 6 grade III (11%). 31 patients (57%) presented with intracranial haemorrhage, 12 patients (22%) with seizures. Of the 54 patients, 51 (94%) had angiographically confirmed obliteration of their AVM. Median follow-up for the entire cohort was 7 years. 83% of surgical patients have mRS 0-1, compared to 78%, 67%, 45%, 18% of patients managed by endovascular therapy, radiosurgery, combination therapy, conservative surveillance, respectively (p < 0.0001). However, the groups were not comparable in terms of SM grade or clinical presentation and the numbers in each group were relatively small. Seizure presentations were encountered in 23% (32/141) of the overall patients, and all the surviving patients were on anticonvulsants, except in the surgical arm, 7/12 (58%) patients were off their antiepileptic medications at last follow-up. CONCLUSIONS: The results demonstrate a 94% surgical obliteration rate and 11% long-term neurological deficits for brain AVM patients managed surgically and were comparable to expert series. Achieving acceptable results is possible in lower volume settings, however, patient selection is important and the role of an experienced neurovascular team cannot be overstated.

Radiologic Surveillance of Untreated Unruptured Intracranial Aneurysms: A Single Surgeon's Experience.

BACKGROUND: The management of untreated unruptured intracranial aneurysms remains controversial. The natural history is still not well understood and many patients are not routinely followed up. We present a single surgeon's data on radiologic surveillance of these lesions. METHODS: A total of 94 patients with 152 unruptured intracranial aneurysms, with a mean follow-up time of 3.4 years from the time of diagnosis, underwent surveillance using computer tomogram angiography, magnetic resonance angiography, or digital subtraction angiography. Aneurysm growth was defined as an increase in ≥1 dimensions above the measurement error. Statistical analysis was performed. RESULTS: Of 152 aneurysms, 126 (83%) were <7 mm, 25 (16%) were 7-12 mm, and 1 aneurysm was 13-24 mm. Eighteen of 152 (12%) cerebral aneurysms in 17 patients grew larger; 7% (9/126) of the aneurysms were <7 mm and 36% (9/25) of the aneurysms were 7-12 mm enlarged. Spontaneous aneurysmal rupture occurred in 4 of 152 aneurysms (2.6%) (i.e., 4/94 patients [4%]), with an average initial aneurysm size of 5.7 mm. The risk of aneurysm rupture per patient-year was 5% with growth, 0.2% without growth, and there was a 24-fold increase in aneurysmal rupture risk for growing aneurysm (P = 0.005). Of aneurysms in group 1 patients (no previous subarachnoid hemorrhage [SAH]) 15% (16/109) compared with 5% (2/43) of group 2 (previous SAH) aneurysms showed evidence of growth during the study period (P = 0.0424). CONCLUSIONS: These results support imaging follow-up of patients with untreated unruptured intracranial aneurysms, including those with aneurysms smaller than the current treatment threshold of 7 mm. Apart from the initial size, aneurysm growth is associated with an increased risk of SAH and therefore growing aneurysms warrant treatment. The data also demonstrated that incidental aneurysms, in patients without previous SAH, do not behave less aggressively, contrary to current opinion.

Defending a traditional practice in the modern era: The use of lumbar puncture in the investigation of subarachnoid haemorrhage.

INTRODUCTION: Acute severe headache is a common medical presentation, and a common area of diagnostic uncertainty. Subarachnoid haemorrhage (SAH) is the cause in a minority of patients and has a high rate of morbidity and mortality. Therefore, its conclusive diagnosis with computed tomography (CT) or lumbar puncture (LP) is paramount. With advancement in imaging technology, emerging evidence now suggests that LP is no longer required for a subset of patients as CT has 100% sensitivity in detecting SAH, when performed under specific conditions. OBJECTIVES: To assess the proportion of patients with conclusive CSF xanthochromia results following a negative CT scan in suspected SAH to determine the diagnostic efficacy of LP. METHODS: CSF bilirubin and oxyhaemoglobin spectrophotometric absorbance data from all centres in a regional health board were identified for consecutive patients over a 6-month period. Results were stratified as conclusive (positive or negative), or inconclusive according to national guidelines. RESULTS: 239 of 255 (93.7%) results were conclusive: 89.0% were negative (227 of 255). 4.7% of results were positive (12 of 255), revealing 4 cerebral aneurysms requiring treatment. 16 out of 255 (6.3%) samples were inconclusive, yielding 1 aneurysm requiring treatment. In the same period, there were 27 CT-positive cases of SAH. CONCLUSIONS: LP has a high diagnostic yield, eliminating the need for neurosurgical opinion or investigation in almost 90% of cases. The test is both cost and time efficient and subjects only a small number of patients to the radiation and contrast risks of angiography.

Carotico-cavernous fistula secondary to Varicella zoster?

We describe the case of a previously well, 73-year-old male patient who presented with a spontaneous high flow, carotico-cavernous fistula, 1 month following an attack of herpes zoster. We postulate that the zoster virus was the underlying cause, given the history and time frame between the preceding shingles and the subsequent development of the fistula. The literature supporting this hypothesis is reviewed.

Case report of transient acquired Foix-Chavany-Marie syndrome following sequential trauma.

Foix-Chavany-Marie Syndrome (FCMS) or bilateral opercular syndrome is characterised by faciopharyngoglossomasticatory diplegia with automatic voluntary dissociation and is a rare form of pseudobulbar palsy most commonly associated with occlusive cerebrovascular disease. We present a transient manifestation of the syndrome, in a patient who suffered two sequential traumatic brain injuries.

Familial Dandy-Walker syndrome: a case report supporting an autosomal inheritance.

INTRODUCTION: We report an isolated pedigree in which a consanguineous couple had twin sons with Dandy-Walker malformation (DWM). The mother is similarly affected with the disorder. DISCUSSION: DWM is an abnormality of the central nervous system, which leads to hydrocephalus and is associated with other abnormalities. CONCLUSION: Inheritance of the disorder remains controversial, with the majority perceived to be sporadic cases. This report suggests an autosomal inheritance.