<prompt> Mercedes Benz sign or seagull sign is seen inGall stonesRenal stonesCBD stonesHydatid cyst  <response>: Mercedes Benz sign or Seagull sign The Centre of gallstone may contain radiolucent gas in a triradiate or biradiate fissure This gives rise to characteristic dark shapes on radiograph, the Mercedes Benz sign or Seagull sign Ref: Bailey and love 27th edition Pgno : 1199 