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Table 1 Differential diagnosis according to the lesion site.

From: Cholesterol granuloma presenting as a mass obstructing the external ear canal

PETROUS APEX MIDDLE EAR CAVITY EXTERNAL MEATUS
Glomus tumor Cholesteatoma Osteoma
Meningioma High jugular bulb Bony stenosis
Schwannoma Carotid artery aberrance Cholesteatoma
Arachnoid cyst Glomus tumor Brain hernia
Plasmocytoma Hemotympanum  
Lymphoma Brain hernia  
Histiocytosis X   
Epidermoid cysts   
Mucocele   
Carotid aneurism   
Bone and cartilaginous tumors