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Ultrasound can establish whether a mass is a simple cyst and can, therefore, be ignored, or whether the lesion is solid and, therefore, is likely to be a renal carcinoma.
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A mass with mixed cystic and solid features could be a Renal tumour, a Renal abscess, or possibly a complex benign cyst or other benign condition.
Ultrasound in renal masses.
(a) Simple cyst (C) showing sharp walls and no echoes arising within the cyst. Note the acoustic enhancement behind the cyst.
(b) Tumour showing echoes within a solid mass (M).
(c) Complex cystic mass which could be due to cystic renal cell carcinoma.
