Possible findings of AAD case in HRCT Temporal Bone

  • Earliest sign à scutum erosion
  • Ossicular discontinuity
  • Dural / sinus plate erosion
  • Facial canal erosion / facial nerve involvement
  • Localization of peri labyrinthine fistula
  • Involvement of sinus tympani / facial recess
  • Involvement of petrous apex / sinodural angle / perilabyrinthine or perifacial cells
  • Antrum opacity
  • Intra cranial abcess
  • Delta sign (lateral sinus thrombophlebitis)
  • Otitic hydrocephalus