title: Enhancing subdural effusions mimicking acute subdural hematomas following angiography and endovascular procedures: report of 2 cases.
abstract: Hyperdense enhancing subdural effusion due to contrast extravasation has been recently described as a potential mimicker of acute subdural hematoma following a percutaneous coronary procedure. Herein, the authors report on 2 patients who presented with subarachnoid hemorrhage from ruptured cerebral aneurysms and who developed enhancing subdural effusions mimicking acute subdural hematomas after angiography and endovascular coil placement. In 1 case, the subdural effusions completely cleared but recurred after a second angiography. CT attenuation values higher than expected for blood, as well as the evolution of the effusions and density over time, allowed for differentiation of enhancing subdural effusions from acute subdural hematomas.
authors.affiliation: Division of Neuroradiology, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland.
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Zamora
authors.affiliation: Division of Neuroradiology, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland.
authors.forename: Doris D
authors.initials: DD
authors.lastname: Lin
mesh_terms: D000368:Aged; D017542:Aneurysm, Ruptured / Q000150:complications / Q000601:surgery; D002533:Cerebral Angiography; D003937:Diagnosis, Differential; D018450:Disease Progression; D057510:Endovascular Procedures / Q000009:adverse effects / Q000379:methods*; D017809:Fatal Outcome; D005260:Female; D020199:Hematoma, Subdural, Acute / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis / Q000209:etiology / Q000601:surgery; D015607:Stents; D013345:Subarachnoid Hemorrhage / Q000150:complications / Q000601:surgery; D013353:Subdural Effusion / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery*; D016896:Treatment Outcome
keywords: HU = Hounsfield unit(s); aneurysm; mimic; rupture; subarachnoid hemorrhage; subdural effusion; subdural hematoma; trauma; vascular disorders