HRCT temporal bone showed severe degree of ossification of right membranous labyrinth involving both cochlea and semicircular canals with sparing of the vestibule. There were features of chronic oto-mastoiditis on both sides, more severely affecting the right middle ear cavity. Hence, the diagnosis of labyrinthitis ossificans was given.

Labyrinthitis ossificans is a condition characterized ossification of membranous labyrinth to varying degrees, ranging from mild haziness of the lucent labyrinth to complete obliteration. It is usually secondary to prior infection, inflammation or trauma. 

MRI and CT are complementary to each other, with MRI being more sensitive in the early pre-ossification stages of labyrinthitis.  

Heavily T2-weighted MRI sequence (CISS) of the inner ear can identify intermediate signals in the normally hyperintense inner ear.