eMedicine Specialties > Radiology > Genitourinary
Renal Cell Carcinoma: Follow-up
Updated: Oct 28, 2009
Intervention
Because RCCs are usually resistant to chemotherapy and radiation therapy, surgical resection offers the best likelihood of cure. Patients with unresectable RCCs have a 5-year survival rate of less than 20%.18,19,20,21,22
It used to be thought that when a solitary mass is noted in a patient with suspected RCC, image-guided biopsy is unnecessary. In one older series, fine-needle aspiration of solitary proven RCCs had a yield of 40% definitely malignant, 36% questionably malignant, and 24% negative tumors.
However, there has been increasing recognition that there is a high incidence of benign tumors when core biopsies are performed of small enhancing masses prior to definitive therapy. In a series of 488 patients taken directly to surgery, 1.6% of the masses were nonneoplastic and 18% benign. In another series, of 119 patients who underwent core biopsy, 20.1% had benign masses. In an additional series of 152 patients with core biopsies for focal abnormalities, 61 biopsies were benign and only 6 nondiagnostic. In this series, 60.5% of the biopsies impacted patient management.
In a patient with a prior malignancy, lymphoma, or multiple masses, fine-needle aspiration or preferably core biopsy guided with CT or US may prove very helpful in treatment planning. In one series, 31 of 54 biopsies performed for a new renal mass in a patient with a known malignancy proved to be RCC.
Image-guided radiofrequency or cryogenic ablation has been used to treat patients with RCC, especially patients with a high surgical risk, aversion to surgery, or bilateral lesions. The role for these minimally invasive techniques is ever increasing to include indications such as patient preference. Recent studies have reported short-term success rates of up to 97% with 1 or 2 ablation sessions, with size (<3 cm) and noncentral location being significant determinants for tumor eradication in a single session. Complication rates are low. Radiofrequency ablation can also be considered in patients with local recurrence. In patients considered for ablation, preprocedure biopsy is important because, in one series, 10 out of 27 patients (nearly 40%) referred for ablation had a benign diagnosis.
Special Concerns
- Pregnancy
- When RCC is suggested in a pregnant patient, US should be considered first for imaging, especially in the first trimester. CT also can be useful and the radiation exposure to the fetus is justifiable, especially if the clinical picture is confusing; any fetal damage is unlikely at the radiation doses typically used. The dose should be kept to a minimum by increasing the pitch and decreasing the microamperes. MRI is good for detecting, characterizing, and staging renal masses and avoids the exposure to ionizing radiation.
- The use of the most appropriate and accurate diagnostic method (contrast-enhanced CT or MRI) and the most appropriate treatment of the mother is most likely to result in long-term benefit to the fetus. Nephrectomy can be performed with the least morbidity to the mother and fetus in the second trimester and is probably preferable to leaving a malignancy untreated throughout pregnancy.
- Contrast agent allergy
- If contrast enhancement is needed, actions can be taken to decrease the risk of an adverse reaction in patients with an allergy to iodinated contrast material. The patient can be premedicated with steroids and histamine blockers. Use of low-osmolar contrast may also help.
- In patients who have had previous life-threatening reactions, the use of iodinated contrast material should be avoided.
- Renal insufficiency
- In patients with renal insufficiency, avoiding or limiting intravenous iodinated contrast material and ensuring adequate hydration is best if the creatinine levels are above 2 and if the patient is not receiving long-term dialysis. Poor renal function also results in failure to opacify the kidneys and collecting system, limiting evaluation of the kidneys. In patients with renal insufficiency, MRI is an excellent alternative to CT.
- Another consideration in patients with abnormal renal function not yet requiring dialysis is that nephrectomy will likely result in dialysis dependence. In these patients, accurate diagnosis and staging is imperative and is probably best accomplished by using contrast-enhanced MRI.
- In patients already undergoing dialysis, iodinated contrast material does not need to be avoided, and in fact CT is preferable to MRI due to the small but documented risk of nephrogenic systemic fibrosis (NSF).
More on Renal Cell Carcinoma |
| Overview: Renal Cell Carcinoma |
| Imaging: Renal Cell Carcinoma |
Follow-up: Renal Cell Carcinoma |
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Further Reading
Related eMedicine topics
Renal Cell Carcinoma (from Oncology)
Clear Cell Renal Cell Carcinoma
Clear Cell Sarcoma of the Kidney
Kidney, Lymphoma
Cystic Diseases of the Kidney
Clinical guidelines
ACR Appropriateness Criteria Renal Cell Carcinoma Staging
ACR Appropriateness Criteria Follow-up of Renal Cell Carcinoma
Clinical studies
A Phase I Study of Bevacizumab and Sunitinib in Metastatic Renal Cell Carcinoma Patients
A Study Evaluating Tarceva in Combination With Avastin Versus Avastin Alone in Treating
Metastatic Renal Cell Carcinoma
Keywords
renal cell carcinoma, renal adenomas, clear cell carcinomas, RCC, hypernephromas, kidney cell carcinoma, kidney carcinoma, nephric carcinoma, nephric cell carcinoma, renal cancer, kidney cancer, nephric cancer, renal cancer, kidney cell cancer
Follow-up: Renal Cell Carcinoma