Figure 11b. Multiloculated renal mass evaluated with different imaging modalities. (a) Longitudinal sonogram of a 42-year-old man shows a multiloculated mass, which was diagnosed as renal cell carcinoma. GB = gallbladder. (b) Axial T2-weighted MR image of the same patient shows the 11-cm-diameter, sharply marginated, multiloculated renal cell carcinoma. (c) Multilocular cystic nephroma in a 49-year-old woman in whom a renal cyst was aspirated 20 years earlier. CT scan shows an 11-cm-diameter multiloculated mass. Note that a portion of the mass projects into the renal pelvis (arrow), a feature suggestive of multilocular cystic nephroma.