3ANTHONY P F, ANTHONY W P. Surgical treat- ment of external auditory canal cholesteatoma[J].Laryngoscope, 1982,92 : 70- 75.
4SHIN S H, SHIM J H, LEE H K. Classification of external auditory canal cholesteatoma by computed tomography[J]. Clin Exp Otorhinolaryngol, 2010,3: 24-26.
6HEILBRUN M E,SALZMAN K L, GLASTONBUR Y C M, et al. External auditory canal cholesteatoma clinical and imaging spectrum[J].AJNR AM J Neuro radiol, 2003,24. 751- 756,.