Postdiscogram Radiographs And Computed Tomography

■ AP and lateral plain radiographs should be performed shortly after injection to avoid contrast media resorption. A number of techniques such as digital substraction tomography in coronal and sagittal planes, and craniocaudal or caudocranial tangential radiographic views have been recommended by certain authors in corpulent patients, or to obtain more detailed information (9,38,39).

■ At present, CT discography is strongly recommended (Fig. 22) (40). CT discography can provide findings up to two hours after injection (9). Thin slices spiral acquisition allows axial, sagittal, and coronal reformations.

FIGURE 21 Myelography showing communication between the subarachnoid spaces and the disc at the L3-L4 level. Anteroposterior (A), oblique (B), lateral (C) plain radiographs. Sagittal computed tomography reformation (D). Source: Courtesy of Dr. X. Zhu.

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