Most common extracranial complication of ASOM is: (A) Facial nerve paralysis, (B) Lateral sinus thrombosis, (C) Subperiosteal abscess, (D) Brain abscess
Answer is C. 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.