Which of the following describes the effect of spondylolysis on radiographic view?

The positive Scotty dog sign is an important radiographic finding associated with spondylolysis, which is a defect in the pars interarticularis of the vertebrae. When viewing an oblique radiograph of the lumbar spine, the "Scotty dog" analogy is used to visualize the lumbar vertebrae. In this representation, the dog's eye corresponds to the superior articular process, the nose represents the transverse process, and the body of the dog correlates with the vertebral body.

In the case of spondylolysis, there is a break or defect in the pars interarticularis, which disrupts the normal alignment of the vertebral components. This defect results in the appearance of a “collar” on the Scotty dog, indicating the presence of spondylolysis. The identification of this collar is a critical diagnostic marker when evaluating for this condition on radiographs.

The other options do not accurately describe the radiographic findings associated with spondylolysis. A herniated disc sign pertains to changes in the intervertebral disc rather than the bony defects seen with spondylolysis. Slipped vertebrae indication relates to spondylolisthesis, which