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Subdural hematoma - swirl sign

Case contributed by Ayush Goel
Diagnosis almost certain

Presentation

Road traffic accident

Patient Data

Age: 45 years
Gender: Male

Left subdural hematoma with hypodensities interspersed within the hyperdense collection (swirl sign).

Case Discussion

The swirl sign refers to the noncontrast CT appearance of acute extravasation of blood into a hematoma. It represents unclotted fresh blood which is hypoattenuating than clotted blood which surrounds it.

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