Radiological sign of spondylolysis is: (A) Napoleon's hat sign, (B) 'Scottsh dog with collar' sign, (C) Winking owl sign, (D) 'Cap' sign
Answer is B. Spondylolysis is a defect or fracture of the pars interaicularis. On the "Scotty dog" view, it is seen as a band of radiolucency through the "neck," like a collar. Ref: Maheshwari 6e pg 224,262,284.