Renal Cell Carcinoma Differential Diagnoses
- Author: Brendan Curti, MD; Chief Editor: Jules E Harris, MD more...
Diagnostic Considerations
In 25-30% of patients, renal cell carcinoma (RCC) is asymptomatic and found incidentally on a radiologic study. A renal mass of indeterminate etiology should be monitored periodically by imaging study such as intravenous pyelography (IVP), ultrasonography, or computed tomography (CT) scanning.
A cystic mass can be simply observed; however, patients with a solid mass should have a complete workup, including evaluation for metastatic disease and vascular extension of the primary tumor. In fact, as many as one third of patients with clinically localized disease may develop metastatic disease after nephrectomy, so they should be monitored carefully. The major medical pitfall is ignoring a solid renal mass and failing to provide appropriate follow-up care.
Excruciating, sharp, bandlike back pain may be an early warning for spinal cord compression due to metastatic renal cell carcinoma and should not be ignored. Urgent magnetic resonance imaging should be performed to rule out cord compression, and high-dose dexamethasone therapy should be started.
Go to Clear Cell Renal Cell Carcinoma and Sarcomatoid and Rhabdoid Renal Cell Carcinoma for complete information on these topics.
Differential Diagnoses
- Abscess
- Angiomyolipoma (benign neoplasm)
- Lymphoma, Non-Hodgkin
- Metastasis from a distant primary lesion
- Metastatic melanoma
- Oncocytoma (benign neoplasm)
- Pyelonephritis, Acute
- Pyelonephritis, Chronic
- Renal adenoma (benign neoplasm)
- Renal cyst
- Renal infarction
- Sarcoma
- Wilms Tumor
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| Cell Type | Features | Growth Pattern | Cell of Origin | Cytogenetics |
| Clear cell | Most common | Acinar or sarcomatoid | Proximal tubule | 3p- |
| Chromophilic | Bilateral and multifocal | Papillary or sarcomatoid | Proximal tubule | +7, +17, -Y |
| Chromophobic | Indolent course | Solid, tubular, or sarcomatoid | Cortical collecting duct | Hypodiploid |
| Oncocytic | Rarely metastasize | Tumor nests | Cortical collecting duct | Undetermined |
| Collecting duct | Very aggressive | Papillary or sarcomatoid | Medullary collecting duct | Undetermined |

