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AJNR - American Journal of Neuroradiology

A, Initial sagittal T1-weighted image (600/8/2 [TR/TE/excitations]), obtained 120 hours after symptom onset, reveals a long-segment EDH that is isointense in signal to spinal cord and is causing severe cord compression (arrows).

B, Sagittal T1-weighted image (400/8/2), obtained after the intravenous administration of contrast material, shows a mixed pattern of central (arrowheads) and peripheral (straight arrows) enhancement that likely reflects both enhancement of the hematoma itself and dural enhancement. Linear enhancement within the hematoma (curved arrow) may represent septa or vessels in lateral extensions of epidural fat.

C, Axial T1-weighted image (500/9/2), obtained at the level of the central enhancement seen in B, shows the absence of hyperintensity within the hematoma before the administration of contrast material (arrows).

D, Axial T1-weighted image (650/9/2), obtained after the intravenous administration of contrast material and at the level of the central enhancement seen in B, shows a mixed pattern of central (arrowheads) and peripheral (curved arrow) enhancement.

E, Sagittal T2-weighted image (4000/98/2) shows that the hematoma is hyperintense to spinal cord with focal hypointensity that may represent deoxyhemoglobin and/or fibrous septa (arrows).

F, Follow-up sagittal T2-weighted image, obtained 6 days after the initial imaging was performed, shows that nearly complete resolution of the EDH (arrows) was achieved with conservative management.

A, Initial sagittal T1-weighted image (483/15/23), obtained 14 hours after the ictus, reveals a short-segment EDH that is isointense to spinal cord (arrows).

B, Sagittal T1-weighted image (400/15/2), obtained after the administration of contrast material, shows faint, peripheral enhancement (arrows).

C, Enhanced axial T1-weighted image (433/17/2) shows minimal peripheral enhancement and severe cord compression (arrowheads).

D, Sagittal T2-weighted image shows that the hematoma is slightly hyperintense to cord with focal hypointensity (arrows).

E, Axial CT image, obtained during percutaneous sampling of the epidural mass (described in the methods), shows the tip of the needle within the epidural collection.

F, Follow-up sagittal T1-weighted image (500/10/2), obtained 22 days after the initial imaging and percutaneous aspiration were performed, shows complete resolution of the hematoma.

A, Initial sagittal T1-weighted image (400/14/3), obtained 48 hours after the onset of headache and neck pain that clinically was suspicious for subarachnoid hemorrhage, reveals an EDH at C2-C3 (arrowheads) that is isointense to spinal cord.

B, Sagittal T1-weighted image (733/20/2), obtained after the administration of contrast material, shows striking central enhancement.

C, Axial gradient-echo image (500/12/2; flip angle, 20°), obtained at the C5 level, shows minimal deformity of the spinal cord from the posterolateral EDH (arrowheads).