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Fig 2. Mismatch between DWI and DPI, with a small lesion. EPI DWI axial b = 0 (A), b = 500 (B), b = 1000 (C) and coronal b = 0 (D), b = 500 (E), b = 1000 (F) sequences. Early coronal (H) and delayed postcontrast T1-weighted axial (G) and coronal (I) sequences. Progressive signal-intensity decay was observed in the right mastoid with DWI (A–F, small arrows). DWI was considered negative for residual cholesteatoma. Conversely, a hypointense lesion was observed on early-enhanced T1-weighted MR images (H, large arrow), with a ring enhancement on DPI (G and I, large arrows). At surgery, a 3-mm large pearl-like residual cholesteatoma was found.
