Fig. 8.

False positive case of proteinaceous fluid in the mastoid remnant. The coronal a b1000 image shows a small focus of high signal (white arrow) postero-medially at the mastoid remnant, which returned low signal on the ADC map, but was distant from the site of the original middle ear cholesteatoma which was excised with high surgical confidence. At the clinico-radiological meeting, it was decided to monitor this annually with DWI. b The subsequent coronal b1000 image showed the high signal focus (white arrow) remained unchanged over 2 years making it more unlikely to represent residual disease. c The corresponding non-contrast enhanced T1 weighted image showed the lesion (white arrow) returned high T1 signal suggestive of proteinaceous fluid given its stability