Tag Archive | spine

Haemosiderin cap sign – a spinal tumour appearance where a cap…

Haemosiderin cap sign – a spinal tumour appearance where a cap of hypointense haemosiderin is seen on T2 weighed imaging above and / or below the tumour due to previous haemorrhage. It is most often associated with spinal ependymomas, being seen in 20-33% of these cases.  The sign however may also be seen in hemangioblastomas and paragangliomas and therefore while it is highly suggestive of ependymoma it is not pathognomonic. 

See our YouTube video tutorial on ‘Spinal Ependymoma’ here.

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Bamboo spine – seen in ankylosing spondylitis as a result of…

Bamboo spine – seen in ankylosing spondylitis as a result of vertebral body fusion by syndesmophytes and often fusion of the posterior elements as well. It predisposes to unstable spinal fractures and inflammatory intervertebral disc lesions known as Anderson lesions. Another plain radiograph sign of ankylosing spondylitis is the dagger sign where the spinous processes are fused.  

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Winking owl sign – vertebral metastases are common in oncology…

Winking owl sign – vertebral metastases are common in oncology patients. A reliable sign of osteolytic spinal metastases on AP radiographs is loss of the normal pedicle contour. The appearance of unilateral pedicle absence has been likened to that of a winking owl with the missing pedicle being the closed eye, the contralateral pedicle being the open eye and the spinous process being the beak. In the above example a metastasis has obliterated the left pedicle at T11. The T12 pedicles are outlined as a reference point.

from our tumblr blog: http://radiologysigns.tumblr.com/post/26466005396

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Toothpaste sign – of extruded intervertebral disc material. On…

Toothpaste sign – of extruded intervertebral disc material. On sagittal imaging the shape of the disc extrusion and relationship to the parent disc often appears like toothpaste being squeezed from a tube.

from our tumblr blog: http://radiologysigns.tumblr.com/post/22768218702

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