<prompt> Investigation of choice for cholesteatoma:Schullers view X-rayOtoscopySkull X-ray, lateral viewHRCT temporal bone  <response>: Ans. d HRCT temporal bone. Ref. Diseases of ENT, PL Dhingra, 3rd ed., 94HRCT delineates extent of bone destruction, degree of mastoid pneumatization, status of dural and sinus plates, plates with low lying dura or an anteposed sigmoid sinus useful when operative treatment is being contemplated and complications if any in a highly better fashion than a Schullers view of mastoid. Cholesteatoma causes destruction in key areas of attic and antrum, which is better seen in lateral view, however HRCT temporal bone gives more precise and greater detailed information. 