Most common extracranial complication of ASOM is
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.
Facial nerve paralysis
Lateral sinus thrombosis
Subperiosteal abscess
Brain abscess
Ear