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Absent pedicle - from spinal metastasis

Case contributed by Dr Frank Gaillard


Mid thoracic back pain.

Modality: X-ray

Absent left pedicle of T11 vertebra.

Modality: CT

Lytic lesion at left pedicle of T11 vertebra.

Case Discussion:

X-rays of the thoracic spine demonstrate the left  T11 pedicle to be absent, seen only on AP projection and is called the winking owl sign. This is confirmed on CT, with evidence of other lytic spinal metastases


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