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FIG 2. 3D-FDSA a 32-year-old woman with a fusiform aneurysm of the left internal carotid artery. Representations on the workstation include 3D-FDSA, 3D-bone, and 3D-DSA modes.
A, Craniocaudal 3D-FDSA view of the skull base shows erosion of the basisphenoid due to expansion of the aneurysm (arrowheads).
B, Same view in 3D-bone mode better depicts the osseous erosion involving the basisphenoid (arrowheads), apex of the petrous bone (long arrow), and lateral aspect of the sphenoid body (short arrows).
C, Same view in 3D-DSA mode provides details of the vascular anatomy. Note decreased attenuation in the posterior aspect of the aneurysm (asterisk) corresponding to the stagnation of contrast agent in the declive portion of the sac, as seen on regular 2D-DSA (not shown).
D, 2D axial reformation of the 3D-FDSA data set (section thickness, 1 mm) reveals that the posterior aspect of the aneurysmal cavity, where contrast agent stagnation is shown, protrudes into the posterior fossa through the eroded basisphenoid (arrow).
E, 2D reformation of the 3D-FDSA data set (section thickness, 1 mm) in an oblique plane parallel to the axis of the petrous bone. Note the detailed rendering of the interface between bone and blood vessels as the carotid artery crosses the carotid canal. Also note the fine anatomic depiction of the inner ear structures.
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