May Be Caused by

 Common

Acoustic schwannoma

Acquired cholesteatoma

Bone neoplasm

Cholesterol granuloma

Chondroma

Chordoma

Congenital cholesteatoma

Hemangioma

Metastasis

Osteoblastoma

 Uncommon

Aneurysm of intracavernous carotid artery

Aneurysm of intrapetrous carotid artery

Carcinoma of external auditory meatus

Cranial nerve IX schwannoma

Cranial nerve V schwannoma

Cranial nerve X schwannoma

Glioma

Glomus jugulare tumor

Gradenigo syndrome

Langerhans cell histiocytosis

Leptomeningeal cyst

Lymphoma

Malignant neoplasm of nasopharynx

Meningioma of Meckel cave

Osteomyelitis

Rhabdomyosarcoma

Tuberculosis