A Medline search the MESH headings Cerebellopontine Angle OR CPA was carried out. A further search was performed for the following MESH headings: neoplasm, tumour, meningioma, epidermoid cyst, CPA cholesteatoma, arachnoid cyst, glomus jugulare, lipoma, dermoid cyst, facial schwannoma, trigeminal schwannoma, vagal schwannoma, cranial nerve neoplasms, glossopharyngeal schwannoma, jugular schwannoma, chondrosarcoma, chordoma, endolymphatic sac, cochlear schwannoma and haemangioma. A search combining the first and second searches was then performed. Finally, the headings vestibular schwannoma and acoustic neuroma were excluded. Additional searches for other rarer pathologies were also performed.