假性蛛网膜下腔出血

假性蛛网膜下腔出血是基底池CT扫描显示的衰减明显增加，模仿了真正的蛛网膜下腔出血。这发生在严重的脑水肿情况下，例如由于脑缺氧。也可能由于鞘内注射造影剂，大剂量静脉造影剂渗入蛛网膜下腔或脑静脉窦血栓形成，严重脑膜炎，软脑膜癌，颅内低血压，小脑梗塞或双侧硬脑膜下血肿引起。

在真正的蛛网膜下腔出血中，基底池的衰减更高，由于血浆的吸收，从血管渗出或形成血肿的血液衰减更高。从非创伤性心肺骤停复苏的患者中，多达20％观察到了伪蛛网膜下腔出血。假性蛛网膜下腔出血的患者的预后可能比真正的蛛网膜下腔出血的患者差，这是因为潜在的疾病进程以及颅内压升高导致的脑灌注减少。因此，与真正的蛛网膜下腔出血相反，假性蛛网膜下腔出血的识别可能会改变患者的治疗计划。

参考
Dixon, Andrew. "Pseudosubarachnoid hemorrhage | Radiology Reference Article | Radiopaedia.org". Radiopaedia.
Given, Curtis A.; Burdette, Jonathan H.; Elster, Allen D.; Williams, Daniel W. (1 February 2003). "Pseudo-Subarachnoid Hemorrhage: A Potential Imaging Pitfall Associated with Diffuse Cerebral Edema". American Journal of Neuroradiology. pp. 254–256.
Marder, Carrie P.; Narla, Vinod; Fink, James R.; Tozer Fink, Kathleen R. (26 December 2013). "Subarachnoid Hemorrhage: Beyond Aneurysms". American Journal of Roentgenology. pp. 25–37. doi:10.2214/AJR.12.9749.
Coulier, Bruno (1 March 2018). "Pseudo-subarachnoid Hemorrhage". Journal of the Belgian Society of Radiology. p. 32. doi:10.5334/jbsr.1509.
Ramanathan, Ramnath Santosh (2018). "Pseudo-subarachnoid Hemorrhage Sign". Annals of Indian Academy of Neurology. pp. 83–84. doi:10.4103/aian.AIAN_152_17.
"Pseudo-Subarachnoid Hemorrhage after Cardiac Arrest". The Western Journal of Emergency Medicine. 31 May 2020.
Additional Sources
Xavier, João; Vasconcelos, Cristiana; Ramos, Cristina (2018). Diagnostic and Therapeutic Neuroradiology: A Case-Based Guide to Good Practice. Springer. p. 207. ISBN 978-3-319-61140-2.
Caplan, Louis R. (2016). Caplan's Stroke: A Clinical Approach. Cambridge University Press. pp. 368–69. ISBN 978-1-316-55279-7.
Kleinman, Paul K. (2015). Diagnostic Imaging of Child Abuse. Cambridge University Press. p. 406. ISBN 978-1-316-29818-3.
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