Injury to middle ear ossicles, Facial nerve, Tegmen injury, Chorda tympani injury.

Patient may at risk of developing loss of hearing, Loss of taste sensation in the anterior 2/3rd of the tongue, Facial palsy and CSF otorrhea.

Alternatively—Endoscopic Ear Drill / Curette can be used which also have the same complications.
Dimensions of Instrument: Straight instruments of size 1 mm, 2 mm Chisel and Mallet.