What anatomic structures comprise the Scotty dog on an oblique lumbar radiograph

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On the oblique lumbar radiograph, the vertebra and its processes can be imagined to outline the shape of a dog (Fig. 10-8 ear = superior articular process; head = pedicle; collar/neck = pars interarticularis; front leg/foot = inferior articular process; body = lamina; hind leg/foot = contralateral inferior articular process; tail = spinous process. Spondylolysis refers to a defect in the region of the pars interarticularis. It appears as a radiolucent defect in the region of the neck or collar of the Scotty dog.

Figure 10-7. Absent pedicle shadow due to vertebral tumor. (From Spine State Art Rev 1998;2(2):178, with permission.)

Figure 10-8. Oblique radiographic view of the lumbar spine. A, Outline on oblique radiograph resembles a Scotty dog. B, Spondylolysis is a fracture in the pars interarticularis region, which appears as a radiolucent band in the neck or collar of the dog. (From Pretorious ES, Solomon JA, editors. Radiology Secrets. 2nd ed. Philadelphia: Elsevier; 2006.)

Figure 10-8. Oblique radiographic view of the lumbar spine. A, Outline on oblique radiograph resembles a Scotty dog. B, Spondylolysis is a fracture in the pars interarticularis region, which appears as a radiolucent band in the neck or collar of the dog. (From Pretorious ES, Solomon JA, editors. Radiology Secrets. 2nd ed. Philadelphia: Elsevier; 2006.)

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