<prompt> Teardrop sign is seen inFracture of zygomatic archFracture of maxillaFracture of mandibleBlow out fracture  <response>: In blowout fractures or fractures of orbital floor, x-ray shows a convex opacity bulging into the antrum from above. This occurs because of the herniation of orbital contents into the antrum. This sign is known as teardrop sign or teardrop opacity. Ref: Textbook of diseases of ENT; PL Dhingra, 7th edition, pg no. 206 