absent pedicle sign

The (absent) pedicle sign, also called the winking owl sign, occurs on plain radiograph of the spine when a pedicle is absent .

The term, winking owl sign, where the missing pedicle corresponds to the closed eye, the contralateral pedicle to the other round open eye, and the spinous process to the beak of the owl on AP views of the thoracic or lumbar spine .



There is a wide etiology :

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