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DOI:10.2214/AJR.07.2247
AJR 2007; 189:W117
© American Roentgen Ray Society

Spinal Subdural Hematoma Does Not Displace Dura from Bone

Frank Berkowitz

Georgetown University Hospital, Washington, DC 20007



 
WEB—This is a Web exclusive article.

In a recent pictorial essay on neonatal spinal disorders, Lowe et al. [1] show an example of a spinal subdural hematoma. Referring to Figure 7, the legend states that echogenic material in the subdural space displaces the dura from the posterior elements.

By definition, the subdural space is the potential space between the dura and arachnoid. The epidural space is between dura and bone. If dura is displaced from posterior elements, then the hematoma is in the epidural space. A subdural hematoma displaces arachnoid from dura but does not affect the relationship between dura and bone.

A hematoma in either space can be a complication of a lumbar puncture. The uniform circumferential nature of the hematoma in the figure suggests that it is, as stated, in the sub-dural space. The echogenic line labeled as dura probably represents a thickened arachnoid membrane.


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  1. Lowe LH, Johanek AJ, Moore CW. Sonography of the neonatal spine: part 2, spinal disorders. AJR 2007;188 : 739-744[Abstract/Free Full Text]

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Am. J. Roentgenol., August 1, 2007; 189(2): W118 - W118.
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