<prompt> Head at risk sign is seen in ?Pehes diseaseEwings sarcomaOsteomylitisPagets disease  <response>: Ans. isai.e., Pehes disease Ref: Pediatric Ohopedic Deformities p.326 Head at risk sign is a radiological prognostic sign for Pehes disease also ka Legg-Calves- Pehes disease or Coxa Planaor Idiopathic avascular necrosis of femoral head. 