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Winking Owl
Here's a great example of the so-called "winking owl." Can you find it?
CNS 3D Anatomy Course 2006 ››
‹‹ Pituitary Adenoma
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CNS 3D Anatomy Course 2006 ››
‹‹ Pituitary Adenoma
USER COMMENTS

T9?

Posted by mpp on Dec 20, 2006 - 07:41 AM

The “winking owl sign” is classically seen on AP radiographs of the thoracolumbar spine.  The eyes of the owl are the pedicles, the head of the owl the rectangle of the vertebral body, and the “beak” the spinous process.  You can imagine the spine looking like a stack of owl heads.  In the image, the left pedicle of T9 (the left eye of T9) is not visible, suggesting destruction of the cortical bone of this pedicle.  This is classically an osteolytic process like metastatic disease.  This particular person had prostate cancer.

How do you know it’s T9?: by counting ribs from the bottom.

Posted by Kenny Liu on Jan 08, 2007 - 07:12 AM
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