The specimens were placed in centrifuge tubes filled with gadopentetate dimeglumine (1:50 dilution) and 10% gelatin by weight. MRI was performed using a 1.5T MRI scanner, using a 1-channel loop coil (Signa HDxt; GE Healthcare, Little Chalfont, UK). Imaging was achieved using the three-dimensional (3D) first-spoiled GRASS protocol. The parameters used were: TR, 11.8 ms; TE, 4.1 ms; flip angle, 30°; FOV, 5 × 5 cm; matrix size, 512 × 512; slice thickness, 1 mm. Source images were made available for analysis on a workstation that enabled interactive multiplanar reformatting of the data sets.