The CT Quadrate lobe hot spot sign

Intense enhancement of the quadrate lobe in the arterial phase may be seen on computed tomography in patients of superior vena cava syndrome. We present this imaging finding in a case of lymphoma causing superior vena cava syndrome and discuss the physiological cause and importance of this sign

Transcranial doppler and hematoma expansion in acute spontaneous primary intracerebral hemorrhage

Context: The data on the role of Transcranial Doppler (TCD) in the management of acute primary intracerebral hemorrhage (ICH) is meager. Aims: To study TCD variables associated with hematoma expansion in acute primary ICH. Settings and Design: The study was carried out in the neurosciences department of Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh from July 2010 to September 2011 employing a prospective, double blinded non randomized study design. Materials and Methods: Acute ICH patients within 24 h of symptom onset were recruited. Baseline neuroimaging study (Computerized tomography, CT scan of brain) was performed to assess the pure hematoma volume by AXBXC/2 method. Baseline TCD parameters were obtained from both the middle cerebral arteries (MCAs; affected and unaffected hemisphere): Peak Systolic velocity, End Diastolic velocity, Mean Flow velocity, Resistance Index, and Pulsatility Index. Follow up (24 h) assessment of hematoma volume and TCD were carried out. Each of the TCD variables were compared in hematoma expansion (>33% increase in hematoma volume on the follow-up CT) and non-expansion group. Statistical analysis: On univariate analysis, the Student's t-test and contingency tables with the X2 test were used. A forward stepwise multivariate logistic regression analysis with hematoma expansion at 24 h as the dependent variable and ROC analysis was carried out, using SPSS software version 16 (Chicago, IL). P value 1.055 as the lone correlate of hematoma expansion (sensitivity of 90% and specificity of 60%). Conclusion: Frequent assessment with TCD could aid in prediction of hematoma expansion by measuring unaffected hemisphere Pulsatility Index ratios

Whole brain atlas-based diffusion kurtosis imaging parameters for evaluation of minimal hepatic encephalopathy

Minimal hepatic encephalopathy (MHE) has no recognizable clinical symptoms, but patients have cognitive and psychomotor deficits. Hyperammonemia along with neuroinflammation lead to microstructural changes in cerebral parenchyma. Changes at conventional imaging are detected usually at the overt clinical stage, but microstructural alterations by advanced magnetic resonance imaging techniques can be detected at an early stage. Whole brain diffusion kurtosis imaging (DKI) data acquired at 3T was analyzed to investigate microstructural parenchymal changes in 15 patients with MHE and compared with 15 age- and sex-matched controls. DKI parametric maps, namely kurtosis fractional anisotropy (kFA), mean kurtosis (MK), axial kurtosis (AK) and radial kurtosis (RK), were evaluated at 64 white matter (WM) and gray matter (GM) regions of interest (ROIs) in the whole brain and correlated with the psychometric hepatic encephalopathy score (PHES). The MHE group showed a decrease in kFA and AK across the whole brain, whereas MK and RK decreased in WM ROIs but increased in several cortical and deep GM ROIs. These alterations were consistent with brain regions involved in cognitive function. Significant moderate to strong correlations (-0.52 to -0.66; 0.56) between RK, MK and kFA kurtosis metrics and PHES were observed. DKI parameters show extensive microstructural brain abnormalities in MHE with minor correlation between the severity of tissue damage and psychometric scores

Reversible dementia: The imitation game

Rapidly progressive dementia (RPD) is an emergency in behavioural or cognitive neurology. Many rare neuroinfections like Neurosyphilis may be missed, if they are not thoroughly evaluated. We report a patient with subacute onset and progressive cognitive decline, extrapyramidal involvement and myoclonic jerks who was initially suspected as probable autoimmune encephalitis or Creutzfeldt-Jakob disease (CJD). Investigations revealed positive serum and cerebrospinal fluid (CSF) Venereal Disease Research Laboratory test (VDRL). On treatment with penicillin, he developed Jarisch-Herxheimer reaction and was treated symptomatically. After two weeks of penicillin, he improved significantly and except for mild short term memory recall, he is asymptomatic for last two years

Multiple brain abscesses due to Enterobacter cloacae in an immune-competent child

Brain abscesses due to Enterobacteriaceae in immune-competent children are rare, and those due to Enterobacter cloacae are even rarer. We report an interesting case of community-acquired E. cloacae neuroinfection resulting in multiple brain abscesses in a young child with no underlying risk-factors. A 10 year-old-boy presented with low-grade fever, headache, neck pain and progressive deterioration of sensorium. On examination, he was conscious but drowsy with photophobia, normal fundii, meningeal signs, mild hypertonia, brisk muscle stretch reflexes and extensor plantar responses. Magnetic resonance imaging of brain showed bilateral, multiple pyogenic abscesses. Culture of the abscess material aspirated at the time of surgical drainage showed growth of E. cloacae. He received intravenous imipenem for 18 weeks guided by clinical and radiological response. A pragmatic approach combining early surgical drainage, targeted antimicrobial therapy and patient-tailored duration based on the clinico-radiological response is needed in such difficult cases. Keywords: Neuroinfection, Enterobacter, Brain abscess, Pyogenic, Carbapenem