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Spinal cord herniation into a mediastinal neurenteric cyst: CT and MRI findings

Departments of ¹ Radiology and ² Neurosurgery, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey

View larger version (147K): [in a new window]   Figure 1. Three-dimensional reconstructed CT image of the thoracic vertebrae demonstrates a large bony defect in the bodies of T3 and T4 vertebrae and kyphosis just above the bony defect. The bodies of T3 and T4 vertebrae seem to be "split".

View larger version (50K): [in a new window]   Figure 2. (a) Axial non-enhanced CT image at the level of anterior spina bifida. Note the wide anterior spina bifida defect and the ventral displacement of spinal cord into the mediastinal cyst (arrow). (b) Axial CT image below the level of spina bifida reveals a well circumscribed posterior mediastinal cyst (arrow heads).

View larger version (102K): [in a new window]   Figure 3. (a) T1 weighted sagittal image (460/15/2 [TR/TE/excitation]) at midline shows the herniation of thoracic spinal cord into the posterior mediastinal cyst through the defect in the vertebrae bodies (open arrow). Note the band extends between the anterior surface of cord and the walls of cyst (arrow head). (b) T2 weighted sagittal (4000/90/2) image reveals the signal void due to cerebrospinal fluid flow in the subarachnoid space towards the lumen of mediastinal cyst (arrow) and in the cyst (open arrow). Note the hypointense band extending between the cord and superior wall of the cyst (arrow head).