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Is a tumor the most probable cause of kidney lesions?

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I have had a recurrent pain since December 2012 on the left side of my back, so my family MD asked me for a full abdominal ultrasound, which showed a 3.4 cm rounded isoechoic lesion. Based on this my urologist have ruled out stones or cysts, since he tells me it's soft tissue. The probable diagnostic is either a benign or malign tumor, but he still needs at least a CT and urine+serum calcium analysis to discard microscopic hematuria or common tumoral symptoms before doing a biopsy. My weight has remained the same since 2010, and I have not had fatigue. My question is: is a tumor the most probable cause of isoechoic lesions in kidneys?


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replied February 16th, 2013
Cancers Answer A42208
Welcome to e health forum.

The simple answer to your question, is Yes.

Isoechoic lesions are radiological description of lesions (tumors or structures) which have the same radiodensity as the surrounding anatomical structures.

In this case, the organ is namely the Kidney.

Isoechoic lesions (as seen on the ultrasound) that originate from the kidney can include
- benign tumors of the kidney tissue - eg. Renal fibroma, Nephroma, metanephric adenoma.
- angiomyolipomas (benign tumors composed of blood vessels, muscles and fat tissue),
- complex renal cysts,
- Renal cell carcinoma (Malignant renal tumors).

But a ultrasound is only a initial imaging modality used since it is inexpensive (comparatively) and there is no exposure to radiation. But it does not give complete anatomic details and has low diagnostic ability compared to modalities like CT or a MRI.

Hence it would be very helpful to make a clear diagnosis in your case, by undergoing a CT scan, as previously mentioned by your doctor.

I hope this helps.


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