<prompt> Gradenigos syndrome is characterized by the following EXCEPTDeafnessRetro-orbital painEar dischargeDiplopia  <response>: Ans a deafness. Ref. Diseases of ENT, PL Dhingra, 3rd ed., 103Petrositis is spread of infection from middle ear and mastoid to petrous part of temporal bone.GRADENIGOS SYNDROME is classical presentation of petrositis and it consists of triad of;1. 6th cranial nerve palsy2. Persistent ear discharge3. Retro-orbitaldeep seated pain Vth cranial nerve palsy 