Atypical radiological findings of primary central nervous system lymphoma.

PURPOSE: Primary central nervous system lymphoma (PCNSL) presenting with atypical radiological findings often leads to delayed diagnosis. We aim to characterize the radiological features and apparent diffusion coefficient (ADC) values of PCNSL with atypical neuroimaging presentation in our local population. METHODS: We retrospectively reviewed all patients with histological diagnosis of CNS lymphoma at our tertiary center from 2005 to 2016. We screened all initial pre-treatment MRIs and excluded cases with typical imaging findings of contrast-enhancing lesions without intra-lesional susceptibility and central non-enhancement. Additional exclusion criteria included (i) relapsed PCNSL, (ii) secondary CNS lymphoma, and (iii) positive HIV status. Two independent raters scored MRI and CT scans at presentation. We computed ADC values in the tumors by 2 methods: single region of interest (ROI1) and multiple ROI (ROI2). RESULTS: Sixteen (25.4%) of 63 patients with CNS lymphoma met inclusion criteria. There were 8 men; median age was 61 (range 22-81) years. Histological diagnoses were diffuse large B cell lymphoma (n = 14) and intravascular lymphoma (n = 2). Fifteen (93%) patients had enhancing lesions (5 solitary; 10 multifocal); most enhancing lesions had T1 hypointense (67%) and T2 mixed (53%) signals, and 6 (40%) had central non-enhancing regions. Nine (56%) patients had lesions with susceptibility. Using the ROI methods, median values for minimum ADC and mean ADC ranged 0.65-0.71 × 10-3 mm2/s and 0.79-0.84 × 10-3 mm2/s respectively. CONCLUSION: PCNSL with atypical radiological features represented one-fourth of our histologically diagnosed lymphoma cases; low ADC values in atypical lesions should prompt clinicians to consider early biopsy for definitive diagnosis.

Correction to: atypical radiological findings of primary central nervous system lymphoma.

The above article was published with incorrect list of authors. We have added Seyed Ehasan Saffari and his affiliation as the addition of the new author to the author list was requested at revision stage.

Predictors and outcomes of withholding and withdrawal of life-sustaining treatments in intensive care units in Singapore: a multicentre observational study.

BACKGROUND: Clinical practice guidelines on limitation of life-sustaining treatments (LST) in the intensive care unit (ICU), in the form of withholding or withdrawal of LST, state that there is no ethical difference between the two. Such statements are not uniformly accepted worldwide, and there are few studies on LST limitation in Asia. This study aimed to evaluate the predictors and outcomes of withholding and withdrawal of LST in Singapore, focusing on the similarities and differences between the two approaches. METHODS: This was a multicentre observational study of patients admitted to 21 adult ICUs across 9 public hospitals in Singapore over an average of three months per year from 2014 to 2019. The primary outcome measures were withholding and withdrawal of LST (cardiopulmonary resuscitation, invasive mechanical ventilation, and vasopressors/inotropes). The secondary outcome measure was hospital mortality. Multivariable generalised mixed model analysis was used to identify independent predictors for withdrawal and withholding of LST and if LST limitation predicts hospital mortality. RESULTS: There were 8907 patients and 9723 admissions. Of the former, 80.8% had no limitation of LST, 13.0% had LST withheld, and 6.2% had LST withdrawn. Common independent predictors for withholding and withdrawal were increasing age, absence of chronic kidney dialysis, greater dependence in activities of daily living, cardiopulmonary resuscitation before ICU admission, higher Acute Physiology and Chronic Health Evaluation (APACHE) II score, and higher level of care in the first 24 h of ICU admission. Additional predictors for withholding included being of Chinese race, the religions of Hinduism and Islam, malignancy, and chronic liver failure. The additional predictor for withdrawal was lower hospital paying class (with greater government subsidy for hospital bills). Hospital mortality in patients without LST limitation, with LST withholding, and with LST withdrawal was 10.6%, 82.1%, and 91.8%, respectively (p < 0.001). Withholding (odds ratio 13.822, 95% confidence interval 9.987-19.132) and withdrawal (odds ratio 38.319, 95% confidence interval 24.351-60.298) were both found to be independent predictors of hospital mortality on multivariable analysis. CONCLUSIONS: Differences in the independent predictors of withholding and withdrawal of LST exist. Even after accounting for baseline characteristics, both withholding and withdrawal of LST independently predict hospital mortality. Later mortality in patients who had LST withdrawn compared to withholding suggests that the decision to withdraw may be at the point when medical futility is recognised.

An Unusual Case of Stroke as the Initial Manifestation of Early Takayasu Arteritis with Normal Erythrocyte Sedimentation Rate (ESR): Diagnosis and Treatment.

BACKGROUND Takayasu arteritis is a rare systemic inflammatory vasculitis of granulomatous nature. The etiology of Takayasu arteritis is still unknown and it affects the aorta and its main branches. Takayasu arteritis is more common in Asians and women of childbearing age. However, ischemic stroke as the initial manifestation of Takayasu arteritis is uncommon. We report a young, stroke patient in early Takayasu Arteritis with normal ESR who improved with immunosuppressants. CASE REPORT A previously healthy young patient was admitted to hospital due to lethargy, limbs claudication, and altered mental status. The patient was also febrile, hypertensive, and her physical examination revealed carotid artery tenderness and a loud carotid bruit suggestive of carotid stenosis or an active inflammatory process. Her erythrocyte sedimentation rate was normal. Magnetic resonance imaging of the brain showed acute ischemic stroke and a computed tomography angiogram showed typical angiographic features, so the diagnosis of Takayasu arteritis with acute ischemic stroke was made. The patient's condition improved with corticosteroid therapy without residual neurological deficits. CONCLUSIONS In conclusion, stroke may rarely be the first symptom of Takayasu arteritis, and the ESR value may be normal even in early, active disease. A normal ESR value should not lead to false reassurance. A thorough clinical examination and angiographic features remain the criterion standard for the diagnosis of Takayasu arteritis. The mainstay of treatment for Takayasu arteritis consists of glucocorticoids and immunosuppressants. Further studies are needed to demonstrate the therapeutic benefit of antithrombotic and vascular intervention in this clinical entity.