Gamuts

Erosion of the petrous ridge, pyramid, or apex

May Be Caused by
Acoustic schwannoma
Acquired cholesteatoma
Aneurysm of intracavernous carotid artery
Aneurysm of intrapetrous carotid artery
Bone neoplasm
Carcinoma of external auditory meatus
Cholesterol granuloma
Chondroma
Chordoma
Congenital cholesteatoma
Cranial nerve IX schwannoma
Cranial nerve V schwannoma
Cranial nerve X schwannoma
Glioma
Glomus jugulare tumor
Gradenigo syndrome
Hemangioma
Langerhans cell histiocytosis
Leptomeningeal cyst
Lymphoma
Malignant neoplasm of nasopharynx
Meningioma of Meckel cave
Metastasis
Osteoblastoma
Osteomyelitis
Rhabdomyosarcoma
Tuberculosis