Foveal hypoplasia in autosomal recessive spastic ataxia of Charlevoix-Saguenay.

A 14-year-old boy presented with a presumed diagnosis of autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS). The neurological examination, nerve conduction study, and brain imaging results were all consistent with the diagnosis. The ophthalmologic examination was notable for a prominent myelinated nerve fiber layer extending from the disk along the major temporal arcades in both eyes. Loss of foveal depression was noted clinically and on spectral domain optical coherence tomography. This case highlights a novel finding that may aid in the diagnosis of ARSACS.

The apolipoprotein gene and recovery from brain injury among extremely preterm infants.

BACKGROUND: Extremely preterm infants have an increased risk of brain injury and, consequently, are more likely to exhibit signs of motor, cognitive or behavioral impairment. Various factors, including genetic, may influence how the brain responds to an injury, ranging from no to complete recovery. The apolipoprotein E (APOE) gene codes for a protein in the brain involved in maintenance and repair of neurons. OBJECTIVE: To determine whether any of the three APOE alleles are related to improved outcome. METHODS: A total of 87 preterm infants with birth weights less than 1,000 g and no obvious preexisting brain abnormalities were genotyped for the APOE gene; 71 of these were assessed with the Bayley III Scales at a corrected age of 12-15 months. Brain MRI was obtained on a subgroup of 52 infants at term equivalent. RESULTS: No significant relationship was found between the three APOE alleles and developmental outcomes or brain MRI findings. CONCLUSION: APOE does not appear to be related in a direct way to the developmental sequelae of white or gray matter injury in extremely preterm infants.

White matter changes in an untreated, newly diagnosed case of classical homocystinuria.

The authors report the case of a 4-year-old boy who developed progressive unilateral weakness and developmental delays prior to his diagnosis of classical homocystinuria. Magnetic resonance imaging (MRI) of the brain demonstrated diffuse white matter changes, raising the concern for a secondary diagnosis causing leukoencephalopathy, since classical homocystinuria is not typically associated with these changes. Other inborn errors of the transsulfuration pathway have been reported as causing these changes. Once begun on therapy for his homocystinuria, his neurologic deficits resolved and his delays rapidly improved. Repeat MRI performed one year after instating therapy showed resolution of his white matter abnormalities. This case illustrates the need to consider homocystinuria and other amino acidopathies in the differential diagnosis of childhood white matter diseases and lends weight to the hypothesis that hypermethioninemia may induce white matter changes.

Depressed heart rate variability is associated with abnormal EEG, MRI, and death in neonates with hypoxic ischemic encephalopathy.

OBJECTIVE: Asphyxia can lead to autonomic nervous system dysfunction, including depressed heart rate variability (HRV). We tested the hypothesis that low HRV is associated with adverse short-term outcomes of abnormalities on electroencephalogram (EEG) and brain magnetic resonance imaging (MRI) and death in neonates with hypoxic ischemic encephalopathy (HIE). STUDY DESIGN: Neonates undergoing hypothermia therapy for HIE underwent monitoring of HRV. HRV in the first day after birth and after hypothermia and rewarming (days 4-7) were analyzed in relation to death and severity of abnormal findings on EEG and MRI. RESULTS: A total of 37 neonates had data available in the first 24 hour after birth and 67 had data days 2 to 7. Depressed HRV was significantly associated with adverse outcomes of death or moderate-to-severe abnormalities on EEG or MRI. In the first 24 hours, the odds ratio (OR) of one or more adverse outcomes for every 10-millisecond decrease in HRV was 3.19 (95% CI, 1.3-7.8; p = 0.01). HRV improved over time but low HRV remained significantly associated with adverse outcomes days 4 to 7 (OR, 2.72; CI, 1.32-5.61; p < 0.01). CONCLUSIONS: Monitoring HRV, which is reflected in the heart rate characteristic index, may provide useful adjunct information on the severity of brain injury in infants with HIE.

Radiation-induced imaging changes following Gamma Knife surgery for cerebral arteriovenous malformations.

OBJECT: The objective of this study was to evaluate the incidence, severity, clinical manifestations, and risk factors of radiation-induced imaging changes (RIICs) following Gamma Knife surgery (GKS) for cerebral arteriovenous malformations (AVMs). METHODS: A total of 1426 GKS procedures performed for AVMs with imaging follow-up available were analyzed. Radiation-induced imaging changes were defined as newly developed increased T2 signal surrounding the treated AVM nidi. A grading system was developed to categorize the severity of RIICs. Grade I RIICs were mild imaging changes imposing no mass effect on the surrounding brain. Grade II RIICs were moderate changes causing effacement of the sulci or compression of the ventricles. Grade III RIICs were severe changes causing midline shift of the brain. Univariate and multivariate logistic regression analyses were applied to test factors potentially affecting the occurrence, severity, and associated symptoms of RIICs. RESULTS: A total of 482 nidi (33.8%) developed RIICs following GKS, with 281 classified as Grade I, 164 as Grade II, and 37 as Grade III. The median duration from GKS to the development of RIICs was 13 months (range 2-124 months). The imaging changes disappeared completely within 2-128 months (median 22 months) following the development of RIICs. The RIICs were symptomatic in 122 patients, yielding an overall incidence of symptomatic RIICs of 8.6%. Twenty-six patients (1.8%) with RIICs had permanent deficits. A negative history of prior surgery, no prior hemorrhage, large nidus, and a single draining vein were associated with a higher risk of RIICs. CONCLUSIONS: Radiation-induced imaging changes are the most common adverse effects following GKS. Fortunately, few of the RIICs are symptomatic and most of the symptoms are reversible. Patients with a relatively healthy brain and nidi that are large, or with a single draining vein, are more likely to develop RIICs.

Primary disseminated leptomeningeal oligodendroglioma with 1p deletion. Case report.

The authors report the case of a 2-year-old boy with a primary, diffuse leptomeningeal oligodendroglioma in which the deletion of chromosome arm lp was identified by performing a fluorescence in situ hybridization (FISH) analysis. This previously healthy child initially presented with malaise, anorexia, nausea, vomiting, and macrocephaly. Imaging studies confirmed the presence of hydrocephalus, and a ventriculoperitoneal shunt was placed. The postoperative course was complicated by emesis, continued weight loss, and numerous seizurelike episodes. A contrast-enhanced magnetic resonance imaging study performed approximately 10 weeks postoperatively showed diffuse leptomeningeal thickening and enhancement without evidence of an intraparenchymal mass lesion. A right frontal lobe brain biopsy revealed a hypercellular proliferation of small oligodendroglioma-like cells, which occupied the leptomeninges diffusely and spared the underlying cortical gray matter. The tumor cells displayed prominent perinuclear clearing and had evenly spaced, uniformly round nuclei. Occasional mitotic figures were observed. Background vessels were thin and delicate, and there was no evidence of necrosis. The tumor cells showed strong immunoreactivity for S100 protein; the results of immunohistochemical staining were negative for glial fibrillary acidic protein, vimentin, epithelial membrane antigen, NeuN, and synaptophysin. The deletion of lp was demonstrated by FISH analysis; lq, 19p, and 19q were intact. This appears to be the first reported case of a primary diffuse leptomeningeal oligodendroglioma in which a lp deletion was identified.

Multiple hibernomas in a 1-month-old female infant.

Hibernoma is a rare benign soft tissue tumor composed of remnants of fetal brown fat. It has only rarely been reported in the literature in patients ranging in age from 2 to 75 years. We present a case of multiple hibernomas occurring in a 1-month-old infant.

Brain imaging as a predictor of early functional outcome following traumatic brain injury in children, adolescents, and young adults.

OBJECTIVES: A depth of lesion (DOL) model using brain imaging has been proposed to aid in medical decision-making and planning for rehabilitation resource needs. The purpose of this study was to determine the early prognostic value of a DOL classification system for children and young adults following severe traumatic brain injury. METHODS AND OUTCOME MEASURES: CT/MRI brain imaging studies on 92 patients, aged 3 to 21, admitted to the Kluge Children's Rehabilitation Center, University of Virginia, were evaluated to determine DOL. Images were classified according to 5 DOL levels (cortical to brainstem). Functional outcomes in mobility, self-care, and cognition, as rated on the WeeFIM instrument, were compared by DOL levels. RESULTS: Admission WeeFIM scores were significantly different for the DOL levels with the highest score for frontal and/or temporal lesions and the lowest for lesions including the brainstem or cerebellum (P<.001). However, the deeper the lesion, the greater the functional gains (P=.05), resulting in discharge WeeFIM scores that were not significantly different across DOL levels. Patients with deeper lesions tended to have longer lengths of stay in rehabilitation but were able to "catch up" with patients who had more superficial lesions. CONCLUSIONS: While relatively simple and convenient, the DOL classification system is limited in its usefulness as an early prognostic tool. It may not be possible to predict outcome in the early acute phase in the intensive care unit on the basis of standard brain imaging alone. Patients with deeper lesions may enter rehabilitation at a more impaired level but can make remarkable progress, though it may take longer than for less severely injured individuals.