1. Complete apicectomy (mastoidotympanoapicectomy);Lempert;Arch Otolaryngol,1937
2. Petrous apicitis: Surgical anatomy;Chole;Ann Otol Rhinol Laryngol,1985
3. Asymmetric pneumatization of the petrous apex;Roland;Otolaryngol Head Neck Surg,1990
4. Asymmetric temporal bone pneumatization: An MR imaging pitfall;Haynes;AJNR Am J Neuroradiol,1988
5. Radiographic differential diagnosis of petrous apex lesions;Jackler;Am J Otol,1992