Renal tumor

Kidney tumour
Micrograph of a renal oncocytoma, a type of benign kidney tumour. H&E stain.
Classification and external resources
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Kidney tumours (or kidney tumors), also known as renal tumours, are tumours, or growths, on or in the kidney. These growths can be benign or malignant (kidney cancer).

Kidney tumours may be discovered on medical imaging incidentally (i.e. an incidentaloma), or may be present in patients as an abdominal mass or kidney cyst, hematuria, abdominal pain, or manifest first in a paraneoplastic syndrome that seems unrelated to the kidney.

There are many forms of kidney tumours:

The RENAL Nephrometry Scoring System is used to measure the complexity of kidney tumors for surgical excision, and is estimated by CT scan as follows:

A higher score indicates a higher difficulty in removing the tumor surgically, potentially making nephrectomy necessary.

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