|Year : 2019 | Volume
| Issue : 1 | Page : 63-65
Synchronous bilateral renal cell carcinomas in “Asynchrony of metabolism”
Hrushikesh Upendra Aurangabadkar1, Lalitha Palle2, Zakir Ali3
1 Department of Nuclear Medicine and PET/CT, Yashoda Hospital, Hyderabad, Telangana, India
2 Department of Radiology, Yashoda Hospital, Hyderabad, Telangana, India
3 Department of Nuclear Medicine and PET/CT, Basavatarakam Indo-American Cancer Hospital, Hyderabad, Telangana, India
|Date of Web Publication||17-Jan-2019|
Hrushikesh Upendra Aurangabadkar
Department of Nuclear Medicine and PET/CT, Yashoda Hospital, Raj Bhavan Road, Somajiguda, Hyderabad - 500 082, Telangana
| Abstract|| |
Here, we present a case of bilateral synchronous renal cell carcinoma in a 52-year-old male patient, who underwent fluorodeoxyglucose positron emission tomography-computed tomography (FDG PET-CT) scan followed by surgical removal of both tumors. On PET scan, left renal mass showed intense FDG uptake while uptake in the right renal mass was minimal. Histopathologically, both tumors were conventional clear cell carcinoma (Fuhrman Grade III). Only the FDG-avid tumor in the left kidney had lymphovascular invasion and necrosis, which are markers of aggressive form of any tumor. FDG PET-CT can act as strong and noninvasive prognostic parameter that could help to identify patients with aggressive disease before treatment.
Keywords: Fuhrman grade, lymphovascular invasion, positron emission tomography, renal cell carcinoma, synchronous primaries
|How to cite this article:|
Aurangabadkar HU, Palle L, Ali Z. Synchronous bilateral renal cell carcinomas in “Asynchrony of metabolism”. World J Nucl Med 2019;18:63-5
|How to cite this URL:|
Aurangabadkar HU, Palle L, Ali Z. Synchronous bilateral renal cell carcinomas in “Asynchrony of metabolism”. World J Nucl Med [serial online] 2019 [cited 2019 Feb 17];18:63-5. Available from: http://www.wjnm.org/text.asp?2019/18/1/63/250322
| Introduction|| |
Paired organs such as lungs, breasts, ovaries, and kidneys are always under similar carcinogenic influence (genetic or environmental). The presence of malignancy in one increases the chances of synchronous or metachronous primary in others. However, popular argument against is that it can be metastatic spread from one to others. Bilateral renal cell carcinoma (RCC) is a rare entity and can present synchronously or asynchronously. Bilateral RCC can be familial or sporadic. Hereditary RCCs are often bilateral and occur at younger ages than sporadic tumor. Among the bilateral sporadic renal lesions, the occurrence of synchronous RCCs is almost equal or can be more than metachronous lesions. Multiple studies report that the incidence of bilateral RCCs is between 1% and 5%. Only <2% of patients with RCC can have synchronous sporadic lesions. Pathologically, usually in bilateral RCC, both histological subtypes are concordant, especially when metachronous; however, discordant subtypes can be present.
Here, we present a case report of a patient with bilateral synchronous RCCs including surgical, pathological, and metabolic features of renal masses.
| Case Report|| |
A 52-year-old male patient with no significant family history of renal malignancies presented to us with diagnosis of bilateral renal masses. Initially, the patient presented with hematuria. He was investigated with ultrasound of the abdomen, which revealed bilateral complex renal masses at the upper pole of the left kidney and lower pole of the right kidney, respectively. Subsequent contrast-enhanced computed tomography (CT) scan of the abdomen suggested enhancing exophytic necrotic mass in the left kidney and large predominantly solid mass in the right kidney. Both masses appeared vascular. They were categorized as T2a tumors (TNM staging). A suspicious metastatic lesion was noticed in the liver. Fine-needle aspiration cytology was performed from both the masses. Cytological findings from the left kidney were positive for atypical cell while those from the right kidney were inconclusive. The patient was referred for fluorodeoxyglucose positron emission tomography/CT (FDG PET/CT) scan with intent to characterize renal masses and liver lesion. Following due consent patient underwent whole body FDG PET/CT scan as per standard protocols. FDG PET/CT images revealed intense heterogeneous FDG uptake in the left renal mass while the uptake in the right renal mass was minimal (isointense with normal renal cortex) [Figure 1]. Maximum standardized uptake value (SUVmax) in the left renal mass was measured 15.5. No FDG uptake was noted in cystic lesions in the liver and was concluded as benign. A solitary FDG-avid 1.5 cm nodule was seen in visualized sections of the left lung SUVmax measuring 14.4. No other metastatic lesion was identified in rest of scan.
|Figure 1: Fluorodeoxyglucose positron emission tomography-computed tomography scan: Contrast-enhanced computed tomography images showed enhancing masses in the lower pole of the right kidney (a, f, i) and upper pole of the left kidney (c, h, i). Fused positron emission tomography-computed tomography images showed no uptake in the right renal mass (b, e, j) and peripheral intense fluorodeoxyglucose uptake in the necrotic left renal mass (d, g, j)|
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Based on PET/CT finding and clinical evaluation, the patient underwent radical nephrectomy on the left and partial nephrectomy on the right side. Histopathological analysis revealed conventional clear cell carcinoma in both kidneys [Figure 2]. Measurement revealed pT1b tumor on the right and pT3a on the left (due to sinus fat invasion). Perinephric fat and Gerota's fascia were free of tumors. Both tumors were “Grade III” on Fuhrman grade. On careful evaluation, the only histopathological difference found between the two masses was lymphovascular invasion (LVI) and necrosis present in the left renal mass.
|Figure 2: Microphotographs of histology of the right (a) and left (b) renal masses. High resolution images of same; right (c) and left (d). Lymphovascular invasion ([e] arrowheads) and necrosis ([f] arrow) in the left renal mass, respectively|
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| Discussion|| |
The difference of metabolic activity patterns between primary and presumed metastatic lesion suggests possibility of two separate disease processes. Here, we observed difference in metabolic patterns of both renal masses, suggesting that both the lesions though synchronous are of independent origins. Surprisingly, both the renal masses have almost identical histology, i.e., conventional clear cell variant. Even the Fuhrman grades were same for both tumors.
Multiple authors have previously evaluated and correlated the variability of FDG uptake to various subtypes of RCC and also to Fuhrman grading. In the largest study of 68 patients, Bertagna et al. found no significant statistical correlation between FDG PET/CT results and Fuhrman grade or histology subtype of primary tumor. The present case is an excellent example of variable FDG uptake in RCC. The patient has developed bilateral synchronous RCC under similar carcinogenic influence still they have different metabolic characteristics. The only histological difference between these renal masses is presence of LVI and necrosis in FDG avid lesion.
LVI is a well-known independent risk factor of poor prognosis in many malignancies. Studies also report that RCCs without LVI have longer metastatic or disease-free survival and overall survival.
FDG PET/CT is the fastest growing onco-imaging modality where more and more authors are correlating biological information obtained from FDG uptake with molecular prognostic marker and clinical outcomes. Among common malignancies such as esophageal, lung, and colorectal cancers, the SUVmax values assessed by PET correlate with patient's outcomes. Studies had previously shown that high tumor glucose metabolism is a cellular characteristic that correlates with the aggressiveness of tumors. SUVmax values of RCC provide valuable prognostic information. Namura et al. evaluated 26 patients of advanced RCC and compared SUVmax values of renal primaries with overall survivals of patients. They concluded that RCC patients with high values of SUVmax could demonstrate poor clinical outcome. In our case, the FDG-avid lesion in the left kidney shows LVI and necrosis on histology [Figure 1] and [Figure 2], which in turn suggests the more aggressive nature of the left renal primary. Increased glucose metabolism in this lesion is in consideration with above discussion about aggressiveness and FDG uptake.
Although TNM stage, Fuhrman grade, and histological findings such as LVI and coagulative necrosis are widely recognized prognostic factors in RCC,, research continues to determine strong and easily available prognostic parameters that could help to identify patients with aggressive disease before starting treatment. FDG PET/CT can be an ideal modality in such a case as it not only provides complete TNM staging of patients but also the prognostic information obtained in the form of FDG uptake is valuable too.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2]