A subdural hematoma (American spelling) or subdural haematoma (British spelling), also known as a subdural haemorrhage(SDH), is a type of hematoma, usually associated with traumatic brain injury. Blood gathers between the dura mater, and the brain. Usually resulting from tears in bridging veins which cross the subdural space, subdural hemorrhages may cause an increase in intracranial pressure (ICP), which can cause compression of and damage to delicate brain tissue. Subdural hematomas are often life-threatening when acute. Chronic subdural hematomas, however, have a better prognosis if properly managed.
In contrast, epidural hematomas are usually caused by tears in arteries, resulting in a build-up of blood between the dura mater and skull.
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http://www.jebmh.com/data_pdf/pankaj%20gupta---final.pdf pankaj gupta, jitendra singh, arvind sharma, shameer deen, aditya chaudhary, nikhil bhansal, akansha tanwar. “epidemiological analysis and clinical characteristics of traumatic brain injuries in rural jaipur:the first single centre experience”. journal of evidence based medicine and healthcare; volume 2, issue 52, november 30,2015; page: 8686-8691, doi: 10.18410/jebmh/2015/1204
bawaskar hs, bawaskar ph, bawaskar ph. rbc acetyl cholinesterase: a poor man's early diagnostic biomarker for familial alzheimer's and parkinson's disease dementia. j neurosci rural pract [serial online] 2015 [cited 2016 may 28];6:33-8. available from: http://www.ruralneuropractice.com/text.asp?2015/6/1/33/143187
http://medind.nic.in/icf/t11/i1/icft11i1p17.pdf a comparative study of treatment of chronic subdural hematoma – burr hole drainage versus continuous closed drainage by shameem ahmed ms et al., indian journal of neurotrauma (ijnt) 2011, vol. 8, no. 1, pp. 17-24
https://www.karger.com/article/fulltext/371841 chronic subdural hematoma infected by propionibacterium acnes: a case report by yamamoto s. asahi t. akioka n. kashiwazaki d. kuwayama n. kuroda s. case rep neurol 2015;7:6-14 (doi:10.1159/000371841)