<prompt> Most common extracranial complication of ASOM isFacial nerve paralysisLateral sinus thrombosisSubperiosteal abscessBrain abscess  <response>: Pus may break through mastoid coex leading to subperiosteal abscess which may even burst on surface leading to a discharging fistula It occurs as a sequence of mastoiditis Ref: Dhingra 7e pg 84. 