Fig. 2

Preoperative magnetic resonance imaging (MRI). On T2-weighted MRI, the cystic mass and septal wall appear as hyperintense and hypointense areas, respectively. Moreover, the continuity between the renal parenchyma and the cystic mass is not clear (a, d – black arrows). T1-weighted MRI does not show a signal change between the in-phase (c, f) and out-of-phase (b, e) images, indicating that the cystic mass has no adipose tissue