Fig. 14.

Using DWI following canal wall down surgery. a DWI b1000 image depicted residual disease (white arrow) at the mastoid tip, also seen as low signal on the b corresponding non-contrast enhanced T1 weighted image and a heterogenous, but predominantly high signal on the c T2 weighted image. d Surgical exploration confirmed residual cholesteatoma pearl (white arrow) walled off in the mastoid tip and was not readily visible on direct inspection at the preceding follow-up clinic. The lesion also had low ADC signal and value