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Subdural hygroma | Radiology Reference Article | Radiopaedia. org Subdural hygromas generally occur along the supratentorial cerebral convexities; occurrence in the posterior fossa is rare 4 CT MRI A subdural hygroma radiographically appears as a crescentic near-CSF density signal accumulation in the subdural space that does not extend into the sulci and rarely exerts significant mass-effect 5
Subarachnoid hemorrhage | Radiology Reference Article | Radiopaedia. org CT The sensitivity of non-contrast CT to the presence of subarachnoid blood is strongly influenced by both the amount of blood and the time since the hemorrhage The diagnosis is suspected when hyperattenuating blood is seen in the subarachnoid space
Neuroradiology threads by Lea Alhilali - How to read a head CT . . . True False Questions On non-contrast head CT, acute intracranial blood is typically brighter than brain parenchyma CT is a density measurement Fresh blood is denser than water brain, so it appears hyperdense (“Blood is Bright”) and should be the first thing you seek on a stat head CT
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Reversible cerebral vasoconstriction syndrome - Radiopaedia. org head trauma neurosurgical procedures spinal subdural hematoma post carotid endarterectomy Diagnosis In 2016, a study proposed a set of criteria to diagnose reversible cerebral vasoconstriction syndrome and to distinguish it from primary angiitis of the central nervous system (PACNS) with a specificity of 98-100% and a similarly high PPV 7:
Investigating altered consciousness (summary) - Radiopaedia. org CT head is the first line investigation, especially in the acute setting 10% of patients will have a cause found 1 MRI can be performed, but usually only after CT making the request what is the likely underlying cause of confusion? what is the urgency of the study? common pathology systemic infection (rarely cerebral) dementia (Alzheimer