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Fig 2. Cavity in the cord: thinning of the beam of tracts and separated tracts (patient 2, DTI6d). This 29-year-old woman presented to our service 3 months after she had experienced a sudden complete paraplegia. Subsequently, no clinical improvement was noted.
A–C, The T2-weighted (A and B) and T1-weighted (C) morphologic sequences showed a central cavity within the thoracic cord, an AVM nidus located at T5, and dilated perimedullary vessels mainly cranial but also caudal to the nidus. There was only a moderate enlargement of the cord, which may have been because of the mass effect of the venous pseudoaneurysm.
D, Anteroposterior view of the angiogram showed the venous drainage of the arteriovenous shunt. There was a venous false aneurysm at the level of the nidus that was partially thrombosed as depicted on MR imaging (hyperintensity on both T1 and T2) and surrounded by hemosiderin (hypointensity on T1 and T2), indicating a previous hemorrhage, responsible for her initial symptoms.
E, Posterior view of the FT6d caudal to the nidus (arrow) showed a global thinning but no interruption of the beam of tracts at the level of the cavity in comparison with the normal size of the white matter tracts at C7 (double arrows). The tracts were separated from the midline but still grouped into fascicles.
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