Findings, case of 67-year-old man, unknown primary tumor

Imaging Findings

A series of PET scan images shows avid increased uptake in the area of the right kidney, extending into the lower pole. There are also suspicious foci of increased uptake just superior and to the midline of the right kidney, in the region of the right hilum, and in the region of the bladder.

Non-contrast, T1-weighted images through the right kidney show a heterogeneous, locular mass involving the right kidney. The increased T1 signal suggests either hemorrhage or other proteinaceous products. No normal parenchyma is visible on these images. T2-weighted images are also heterogeneous. Areas that demonstrated high T1 signal are also bright on T2, suggesting that these are cystic areas containing proteinaceous fluid. These areas could correspond to the collecting system or may be part of the mass. Areas of low T2 signal are likely solid areas.

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