Subtypes

Acquired cholesteatoma

Congenital cholesteatoma

May Cause

Abscess

Acquired skull defect

Destructive lesion in petrous apex

Encephalitis

Erosion of mastoid

Erosion of middle ear

Erosion of tympanic portion of petrous bone

External auditory canal tumor

Facial canal lesion within temporal bone

Facial nerve lesion outside the temporal bone

Gradenigo syndrome

Intraluminal ureteral filling defect

Meningitis

Middle cranial fossa lesion

Multiple ureteral filling defects

Radiolucent skull lesion

Solid renal mass

Solitary osteolytic skull lesion