Dear Editor Acute traumatic brain injury is a worldwide public health crisis. Post-traumatic subarachnoid hemorrhage (SAH) is a finding that is present at a frequency of 40% according to data from American TCDB (1, 2). Among the mechanisms that have been implicated as causes of post-traumatic SAH is the cortical bleeding through the subarachnoid space. It is estimated that the incidence of post-traumatic SAH is 11% to 60% in patients with traumatic brain injury. The brain CT is considered a technique with good sensitivity, economical and available in many hospitals worldwide. We have reviewed the literature and found some imaging characteristics of post-traumatic subarachnoid hemorrhage. We have called “ the five preferences for post-traumatic SAH” . Here we describe...

Objective: Methanol poisoning is a dangerous life-threatening event, manifested with various symptoms, sometimes very rare ones, that all should be addressed to prevent misdiagnosis of the methanol-poisoned patients. Case Presentation: A 21-year-old young man was brought to the emergency department (ED) with a generalized tonic-clonic (GTC) seizure and he was diagnosed with methanol intoxication. A non-contrast computed tomography (NCCT) of the brain demonstrated findings similar to subarachnoid hemorrhage (SAH). After the brain CT, he had a Glasgow Coma Score (GCS) of 3 and all brainstem reflexes were absent. Neurology consultant agreed with the diagnosis of pseudo-SAH. Brain death was confirmed by a positive apnea test within 24 hours of presentation. Conclusion: It is suggested that compression of dural sinuses due to severe brain edema, reduces the venous drainage and leads to venous engorgement, which appears high attenuated in the background of low-density edematous brain matter.

Background & Aim: Subarachnoid hemorrhage (SAH) caused by the rupture of intracranial aneurysms is a devastating event. One of the standard and major treatments for intracranial aneurysms is craniotomy. The aim of this study was to represent the clinical results of microsurgical clipping approach in management of cerebral aneurysmal SAH in our hospital.Methods & Materials/Patients: This retrospective study was conducted in 162 consecutive patients with SAH undergoing clipping of ruptured aneurysm, between March 2011 and December 2015.The following data of patients were collected from patients’ charts: age, sex, the level of consciousness classified by WFNS grading, pattern of SAH in admitted CT-scan, aneurysm characteristics in CT-angiography or cerebral DSA. Modified Rankin Scale (mRs) was assessed at the discharge time and 6 months later by a postal questionnaire and teleph one interview.Results: In total, 131 patients (81%) had good WFNS (grade 0-3) and 31 (19%) had poor WFNS. A total of 142 (88%) patients had one aneurysm and 20 (12%) had multiple aneurysms. Thirty-seven patients (23%) experienced complication during the surgery. In 162 patients treated by microsurgery, 19 (12%) suffered from infection, 8 (5%) suffered from severe vasospasm, and 21 (13%) ischemia; moreover 15 patients (9%) underwent external ventricular drain (EVD). Twelve patients (7%) had hydrocephalus and 9 (6%) required a ventriculo-peritoneal shunt for the management of hydrocephalus. In total, 110 patients (68%) had good prognosis (mRs 0-2) and 52 (32%) had poor outcome. Out of 131 patients with good WFNS, 84% had good mRs. Twenty five patients (15%) died. The poor outcome was associated with poor WFNS, occurrence of ischemia, and high modified Fisher.Conclusion: This study showed that patients with WFNS grade 0-3 aneurysms could undergo successful clipping microsurgery after SAH.

In the present study, numerical investigation of two-dimensional incompressible air flow through a solar air heater (SAH) with a triangular artificial roughness having a curved top corner is performed using ANSYS Fluent 15. 0 based finite volume method. The geometrical parameters of the triangular ribs having a curved top corner such as the roughness height ratio (e/D = 0. 021, 0. 03 and 0. 042) and the roughness pitch ratio (p/e =7. 14, 10. 70, 14. 28 and 17. 86) have been investigated for a varied Reynolds number between 3800 to 18000. Flow and energy governing equations were solved with the accosiation of two transport equation for the turbulence kinetic energy k and the dissipation rate ɛ . The RNG k-ε turbulent model have been selected to be the more appropriate turbulence model for the present study. Results indicates that the values of Nusselt number and friction factor strongly depend on the roughness relative height e/D, relative pitch p/e and the value of Re number. The best solar air heater performance could be obtained for e/D=0. 042 and p/e=7. 14.