Daniel J. A. Connolly

Complications of cerebral angiography: a prospective analysis of 2,924 consecutive procedures

IntroductionCerebral angiography is an invasive procedure associated with a small, but definite risk of neurological morbidity. In this study we sought to establish the nature and rate of complications at our institution among a large prospective cohort of consecutive patients. Also, the data were analysed in an attempt to identify risk factors for complications associated with catheter angiography.MethodsData were prospectively collected for a consecutive cohort of patients undergoing diagnostic cerebral angiography between January 2001 and May 2006. A total of 2,924 diagnostic cerebral angiography procedures were performed during this period. The following data were recorded for each procedure: date of procedure, patient age and sex, clinical indication, referring specialty, referral status (routine/emergency), operator, angiographic findings, and the nature of any clinical complication or asymptomatic adverse event (arterial dissection).ResultsClinical complications occurred in 23 (0.79%) of the angiographic procedures: 12 (0.41%) significant puncture-site haematomas, 10 (0.34%) transient neurological events, and 1 nonfatal reaction to contrast agent. There were no permanent neurological complications. Asymptomatic technical complications occurred in 13 (0.44%) of the angiographic procedures: 3 groin dissections and 10 dissections of the cervical vessels. No patient with a neck dissection suffered an immediate or delayed stroke. Emergency procedures (P = 0.0004) and angiography procedures performed for intracerebral haemorrhage (P = 0.02) and subarachnoid haemorrhage (P = 0.04) were associated with an increased risk of complications.ConclusionNeurological complications following cerebral angiography are rare (0.34%), but must be minimized by careful case selection and the prudent use of alternative noninvasive angiographic techniques, particularly in the acute setting. The low complication rate in this series was largely due to the favourable case mix.

Cerebral perfusion abnormalities in children with Sturge-Weber syndrome shown by dynamic contrast bolus magnetic resonance perfusion imaging.

OBJECTIVE. Sturge-Weber syndrome is characterized by leptomeningeal angiomatosis and a facial naevus that is usually unilateral. Magnetic resonance imaging is the cornerstone of confirming the disease and judging the extent of the abnormalities. It has been shown, however, that brain perfusion abnormalities on nuclear medicine imaging often are more extensive than the abnormal leptomeningeal enhancement on magnetic resonance. In this article, we assess the utility of magnetic resonance perfusion in demonstrating perfusion abnormalities in pediatric cases of Sturge-Weber syndrome. METHODS. Magnetic resonance perfusion studies were performed on 7 consecutive children who presented to our department with clinically suspected Sturge-Weber syndrome. The extent of time to peak abnormality on dynamic gadolinium bolus magnetic resonance perfusion imaging was compared with the extent of leptomeningeal enhancement and the presence of venous abnormalities. RESULTS. Good magnetic resonance perfusion data were obtained in all 7 cases. Perfusion abnormalities were closely anatomically related to meningeal enhancement on postcontrast T1-weighted imaging. However, perfusion abnormalities were found consistently in the vicinity of developmental venous anomalies that were present in 4 of 7 cases. In 1 child, there was a perfusion deficit in the cerebellar lobe contralateral to the leptomeningeal angiomatosis, consistent with crossed cerebellar diaschisis. CONCLUSIONS. Magnetic resonance perfusion is a sensitive indicator of perfusion abnormalities in Sturge-Weber syndrome and can be performed easily at the same time as the diagnostic scan. Magnetic resonance perfusion imaging therefore is useful in the assessment of this disease. This approach has the extra advantage of correlating the perfusion abnormalities with the high-resolution imaging that is provided from magnetic resonance imaging.

Comparison of endoscopic and microscopic trans-sphenoidal pituitary surgery: early results in a single centre

Abstract Introduction. Pituitary surgery has seen a recent shift from a microscopic to an endoscopic trans-sphenoidal approach. We present our early experience with endoscopic surgery and compare the outcome with our recent microscopic experience. Methods. From January 2008 until present time, 80 consecutive patients underwent trans-sphenoidal pituitary surgery in our institution. Until September 2009, all patients had a microscopic trans-septal approach. After this time, the patients underwent endoscopic trans-sphenoidal surgery. All patients underwent pre- and post-operative MRI and full endocrinological evaluation. Data was collected prospectively including tumour volume, endocrine function, visual function, length of stay and complications. Results. There were 40 patients in each group. In the microscopic group, there were 26 non-functioning tumours and 14 functioning tumours. In the endoscopic group, there were 24 non-functioning and 16 functioning tumours. There were significantly better results in terms of tumour resection (p = 0.002) and remission (p = 0.018) in the endoscopic group. In this group there was also a lower incidence of CSF leaks and a shorter length of stay for secreting tumours (p = 0.005). 1 patient in the endoscopic group died at day 43 post-operatively, having initially presented in a poor clinical state with pituitary apoplexy. Conclusion. Microscopic trans-sphenoidal surgery remains the benchmark for future surgical techniques. Our early results suggest that endoscopic trans-sphenoidal surgery provides favourable results in both tumour resection and control of secreting tumours in comparison with microscopic surgery. Further longer-term evaluation is required to ensure the outcome of endoscopic surgery.

Encephalopathy in children: an approach to assessment and management

Childhood encephalopathy is an uncommon but significant paediatric presentation and is associated with significant mortality and long-term morbidity in survivors. By definition it is a somewhat non-specific presentation with a wide differential diagnosis and long list of possible investigations. Choice of investigation, including neuroimaging modality, can be a daunting prospect for the clinician faced with the encephalopathic child and it is important to select appropriately for a high diagnostic yield. Initial management centres on good emergency care irrespective of cause. More specific therapies however vary enormously, and appropriate treatment is important and influences outcome. Evidence exists for mana©gement of many of the individual conditions causing encephalopathy. This review aims to outline a clinical approach to selecting investigations to identify a specific cause and provides an overview of the treatment for the commoner causes of encephalopathy that a general paediatrician may reasonably expect to be faced with.

Profound encephalopathy with complete recovery in three children with familial hemiplegic migraine.

We describe three cousins who presented with agitation, dysphasia and/or coma, and developed hemiplegia following initial onset of symptoms. Two cases followed minor head injuries, two were pyrexial and two were associated with neutrophilia. Two cases required ventilatory support on the intensive care unit. Magnetic resonance imaging in all three cases showed cortical swelling, and one had evidence of restricted water diffusion on diffusion‐weighted imaging, suggestive of ischaemia/infarction. A complete family history at the time of presentation would have led to an earlier diagnosis of profound encephalopathy in familial hemiplegic migraine, which would have enabled better prognostication of their clinical course and caused less distress for the families.

The role of MRI and CT of the brain in first episodes of psychosis

AIM To investigate whether imaging is associated with early detection of the organic causes of the first episode of psychosis (FEP). MATERIALS AND METHODS Individuals with FEP but no neurological signs referred to a tertiary centre for cerebral magnetic resonance imaging (MRI) or computed tomography (CT) were reviewed retrospectively. Two groups were evaluated with either CT or MRI; the two groups were independent and no individual underwent both CT and MRI. RESULTS One hundred and twelve consecutive cerebral MRI and 204 consecutive CT examinations were identified. Three (2.7%) individuals had brain lesions [brain tumour and human immunodeficiency virus (HIV) encephalopathy] potentially accountable for the psychosis at MRI. Seventy patients (62.5%) had incidental brain lesions, such as cerebral atrophy, small vessel ischaemic changes, unruptured Circle of Willis aneurysm, cavernoma, and arachnoid cysts at MRI. Three patients (1.5%) had focal brain lesions (primary or secondary tumours) potentially accountable for the psychosis at CT. One hundred and thirty-three patients (65.2%) had incidental brain lesions unrelated to the psychosis on CT scan. There was no significant difference between MRI and CT imaging in detecting organic disease potentially responsible for FEP (p < 0.001). CONCLUSION Routine MRI or CT imaging of the brain is unlikely to reveal disease leading to a significant change in management. MRI was comparable with CT in terms of diagnosis of both pathological and incidental cerebral lesions. Therefore, routine brain structural imaging of FEP in patients without focal neurology may not be routinely required and if imaging is requested then CT may function equally as well as MRI as the first-line investigation.

Craniospinal Abnormalities and Neurologic Complications of Osteogenesis Imperfecta: Imaging Overview

Osteogenesis imperfecta is a rare genetic disorder that leads to progressive skeletal deformities due to deficits in type I collagen, the main pathophysiologic effect of the disease. In addition, it may lead to a wide range of associated neurologic abnormalities: The central nervous system is usually involved because of softening of bone at the base of the skull, with resultant upward migration of the upper cervical spine and odontoid process into the skull base. Upward migration of the spine may cause compression of the brainstem, mechanical impingement of the spinal canal with restriction of cerebrospinal fluid circulation, and impingement of the cranial nerves. Osteogenesis imperfecta also may directly involve neurovascular structures, leading to cavernous fistulas of the carotid artery, dissection of the cervical arteries, and cerebral aneurysms. The brain parenchyma is frequently affected by the disease, with manifestations including cerebral atrophy, communicating hydrocephalus, and cerebellar hypoplasia. The imaging features of the disorder vary as widely as its clinical manifestations, depending on the severity of disease. Severe forms accompanied by debilitating skeletal fractures and progressive neurologic impairments may lead to perinatal death, whereas milder asymptomatic forms might cause only a modest reduction in life span. The most important advance in medical therapy for osteogenesis imperfecta has been the introduction of bisphosphonate therapy to slow the resorption of bone in patients with moderate to severe forms of the disease (ie, type III or IV). In some patients, neurosurgery may be necessary to correct the effects of severe basilar invagination by the odontoid process.

Neuroimaging in non-accidental head injury in children: an important element of assessment

Head injury from physical abuse is unfortunately a common occurrence in our society. It is a major cause of mortality and long-term physical and psychological disability in children. Diagnosis of non-accidental head injury may be difficult, as most infants present with non-specific clinical findings and without external signs of trauma. Neuroimaging plays a fundamental role both for medical management and medicolegal aspects of child abuse. It is therefore imperative for the radiologist to promptly recognise the radiological findings of various forms of non-accidental head injury to render a more accurate opinion. A standardised imaging protocol and good communication between professionals are essential for optimum management.

Imaging in acute ischaemic stroke: essential for modern stroke care

Stroke is the second most common cause of death worldwide and the third most common in the UK. ‘Time is brain’ in ischaemic stroke; early reperfusion has been shown to lead to improved clinical outcomes, yet the majority of patients with acute stroke do not attend in time for thrombolysis as it is currently licensed, hence the interest in trials extending the therapeutic window. Defining the ischaemic penumbra is of crucial importance in choosing the appropriate patients for thrombolytic therapy who attend outside the optimal therapeutic window. Integrated stroke imaging, including demonstration of potentially salvageable tissue with either MR perfusion/diffusion studies or CT perfusion, is increasingly likely to play a central role in future management strategies and widening of the potential therapeutic window. This review highlights the basic imaging findings of acute stroke and discusses the role of advanced CT and MR techniques as well as options for vascular imaging.

Magnetic resonance spectroscopy changes following haemopoietic stem cell transplantation in children with cerebral adrenoleukodystrophy.

X‐linked cerebral adrenoleukodystrophy is an aggressive, rapidly progressive disorder resulting in considerable morbidity and, left untreated, mortality. Patients typically present before the age of 10 years with progressive symptomatology including ataxia, spasticity, and focal neurological deficits. Current therapeutic options are limited, the treatment of choice being haemopoietic stem cell transplantation (HSCT). Intervention is beneficial to those children with early disease and characteristic magnetic resonance (MR) imaging changes. Developments in MR imaging have led to the incorporation of MR spectroscopy in the assessment tools; however, it is yet to be included in stratified assessment tools to guide treatment choice. Furthermore, there remains a paucity of outcome data on MR spectroscopy changes following HSCT. We describe our experience in two males with confirmed cerebral adrenoleukodystrophy treated, at the mean age of 5 years 6 months, with HSCT and report the pronounced spectroscopic changes observed following treatment. Both children, observed for a minimum period of 14 months following treatment, demonstrate complete reversal in previously deteriorating spectroscopy with marked increase in N‐acetyl‐aspartate (NAA)/choline (Cho) ratios and reduction in Cho/creatine (Cr) ratios following HSCT treatment with concomitant stabilization of clinical status.