Figure 2.

A 61-year-old woman who underwent resection of a small retroauricular adenoid cystic carcinoma 6 months prior to imaging. (a) Axial T1-weighted contrast-enhanced fat saturated MR image shows post-treatment changes with an unchanged small retroauricular soft tissue mass (arrow) over time. (b) DW image at a b-value of 1000 s/mm² depicts this lesion as hyperintense with a low signal on the corresponding ADC map (c) (ADC = 0.82×10⁻³ mm²/s) suspicious for residual tumour. This has been confirmed by histology.