Extreme Anemia Causing Unusual “Black-out” of the Cerebral Vessels on Noncontrast Brain CT
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Noncontrast brain computed tomography (CT) remains often recommended in the emergency setting, particularly to exclude a fresh hematoma or a hemorrhage. Radiologists are also trained to specifically recognize hyperattenuating vascular signs in case of acute clot or thrombosis . Hypodensity of blood is more unusual and more subtle to detect except when it is very marked. We report a case of massive diffuse hypodensity of all cerebral vessels diagnosed during noncontrast brain CT in an extremely anemic patient. The linear relationship between hemoglobin levels and CT attenuation of blood is briefly discussed.
A 57-year-old man was admitted to the emergency department with a 4-day history of diarrhea followed by melenic stools. Fresh rectal bleeding appeared just the last day before admission. The patient had a history of alcoholism and Parkinson’s disease. At admission, the old man was afebrile. Abdominal physical examination appeared normal. The state of...
KeywordsHounsfield Unit Cerebral Vessel Compute Tomography Attenuation Diverticular Bleeding Dural Venous Sinus
Conflict of Interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.