This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Beheaded Scottish terrier sign is – 
Select and explain. 
A. Spondylosis, B. Spondylolisthesis, C. Lumbar canal stenosis, D. Slipped disc
B: Spondylolisthesis
Answer: B: Spondylolisthesis 
Explanation: Oblique view of spine displays the lamina and articular processes more clearly than the classical anteroposterior & lateral views. The shadow of the neural arch resembles that of Scottish terrier dog.
Spondylolysis          → Scotty dog wearing a collar sign.
Spondylolisthesis     → (i) Beheaded Scotty dog sign;

                                                (ii) 'Inverted Napoleon's Hat' sign.