<prompt> Radiological sign of spondylolysis isNapoleons hat signScottsh dog with collar signWinking owl signCap sign  <response>: 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. 