Pseudosubarachnoid hemorrhage

A pseudosubarachnoid hemorrhage is an apparent increased attenuation on CT scans within the basal cisterns that mimics a true subarachnoid hemorrhage.^[1] This occurs in cases of severe cerebral edema, such as by cerebral hypoxia. It may also occur due to intrathecally administered contrast material,^[2] leakage of high-dose intravenous contrast material into the subarachnoid spaces, or in patients with cerebral venous sinus thrombosis, severe meningitis, leptomeningeal carcinomatosis,^[3] intracranial hypotension, cerebellar infarctions, or bilateral subdural hematomas.^[4] In a true subarachnoid hemorrhage, there is higher attenuation on CT scans of the basal cisterns, and blood that has leaked from a vessel or formed a hematoma is more highly attenuated due to the absorption of plasma.^[5] Pseudosubarachnoid hemorrhages have been observed in as much as 20% of patients resuscitated from non-traumatic cardiopulmonary arrest. Patients with pseudosubarachnoid hemorrhages may have worse prognoses than those with true subarachnoid hemorrhages because of underlying disease processes and decreased cerebral perfusion with elevated intracranial pressure.^[6] The identification of a pseudosubarachnoid hemorrhage as opposed to a true subarachnoid hemorrhage may therefore change a patient's treatment plan.^{[citation needed]}

References

Sources

• Xavier, João; Vasconcelos, Cristiana; Ramos, Cristina (2018) (in en). Diagnostic and Therapeutic Neuroradiology: A Case-Based Guide to Good Practice. Springer. pp. 207. ISBN 978-3-319-61140-2. https://books.google.com/books?id=YidFDwAAQBAJ&pg=PA207. 
• Caplan, Louis R. (2016) (in en). Caplan's Stroke: A Clinical Approach. Cambridge University Press. pp. 368–69. ISBN 978-1-316-55279-7. https://books.google.com/books?id=9ZfsDAAAQBAJ&pg=PA368. 
• Kleinman, Paul K. (2015) (in en). Diagnostic Imaging of Child Abuse. Cambridge University Press. pp. 406. ISBN 978-1-316-29818-3. https://books.google.com/books?id=fA94CgAAQBAJ&pg=PA406. 

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