The incidence of simple renal cyst by computed tomography

Tada, Shimpei; Yamagishi, Jiro; Katoh, Harumi; Hata, Yuichi; Kobari, Toshiyuki

doi:10.1016/s0009-9260(83)80238-4

Cited by 216 publications

(120 citation statements)

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“…However, most cystic renal lesions are discovered incidentally on contrast-enhanced abdominal CT examinations performed for non-renal indications [1] and in case of equivocal findings regarding their attenuation on contrast-enhanced CT studies, patients may need to be recalled to undergo a second, unenhanced abdominal CT, a procedure causing increased costs and radiation exposure to the patient. Moreover, the assessment of enhancement of cystic renal lesions may be prone to errors by erroneously assuming a "true" enhancement in the presence of the -so calledpseudoenhancement, which refers to an artificial increase in attenuation of a simple renal cyst following contrast agent application, and is most problematic for small cysts at high levels of renal parenchymal enhancement (8,9).…”

Section: Discussionmentioning

confidence: 99%

“…Cystic renal lesions are estimated to be present in 20 -40% of the population and represent frequent, most of the times incidental findings in abdominal computed tomography (CT) examinations [1]. Alongside the cyst's diameter, wall thickness, presence of septa and contrast enhancing components, the measurement of the mean CT attenuation value (in Hounsfield Units, HU) of the cysts' content on unenhanced CT images as well as the assessment of its attenuation pattern after the administration of intravenous contrast media are supporting the radiologists to classify cystic renal lesions [2].…”

Section: Introductionmentioning

confidence: 99%

“…Cysts surrounded by thin, smooth walls and mean CT attenuation values between 0 -20 HU are considered simple benign cysts if they do not enhance after the application of contrast agents [2][3][4]. These cysts are classified category I by Bosniak [1]. Homogeneous cysts with mean CT attenuation values between 40 -90 HU on unenhanced CT images are considered hyperattenuating cysts if they are also enclosed by thin, smooth walls and do not enhance after contrast agent administration [3].…”

Section: Introductionmentioning

confidence: 99%

“…In case of attenuation values of 40 -50 HU the lesions content may be of haemorrhagic origin [7]. These homogeneously hyperattenuating, non -enhancing cystic renal lesions are considered benign and classified category II by Bosniak [1]. Therefore follow-up CT examinations are not required.…”

Section: Introductionmentioning

confidence: 99%

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Dual-energy CT with tin filter technology for the discrimination of renal lesion proxies containing blood, protein, and contrast-agent. An experimental phantom study

et al. 2010

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PURPOSE: To differentiate proxy renal cystic lesions containing protein, blood, iodine contrast or saline solutions using dual-energy CT (DECT) equipped with a new tin filter technology (TFT). MATERIALS AND METHODS: 70 proxies (saline, protein, blood and contrast agent) were placed in unenhanced and contrast-enhanced kidney phantoms. DECT was performed at 80/140 kV with and without tin filtering. Two readers measured the CT attenuation values in all proxies twice. An 80/140 kV ratio was calculated. RESULTS: All intra-and interobserver agreements were excellent (r = 0.93-0.97; p < 0.001). All CT attenuation values were significantly higher in the enhanced than in the unenhanced setting (p < 0.05; average increase, 12.5 +/-3.6HU), while the ratios remained similar (each, p > 0.05). The CT attenuation of protein, blood and contrast agent solution differed significantly with tin filtering (p < 0.01-0.05). Significant differences were found between the ratios of protein and blood compared to contrast medium solution (each, p < 0.05) and between the ratios of protein and blood in both phantoms with tin filtering (each, p < 0.05). CONCLUSION: DECT allows discrimination between a proxy renal lesion containing contrast agent and lesions containing protein and blood through their different attenuation at 80 kV and 140 kV. Further discrimination between protein and blood containing proxies is possible when using a tin filter.Dual-Energy CT with tin filter technology for the discrimination of renal lesion proxies containing blood, protein, and contrast-agent. An experimental phantom study 1 Abstract Purpose: To differentiate proxy renal cystic lesions containing protein, blood, iodine contrast or saline solutions using dual-energy CT (DECT) equipped with a new tin filter technology (TFT). Materials and Methods:70 proxies (saline, protein, blood and contrast agent) were placed in unenhanced and contrast-enhanced kidney phantoms. DECT was performed at 80/140kV with and without tin filtering. Two readers measured the CT attenuation values in all proxies twice. An 80/140kV ratio was calculated.Results: All intra-and interobserver agreements were excellent (r=0.93-0.97; p<0.001). All CT attenuation values were significantly higher in the enhanced than in the unenhanced setting (p<0.05; average increase, 12.5±3.6HU), while the ratios remained similar (each, p>0.05). The CT attenuation of protein, blood and contrast agent solution differed significantly with tin filtering (p<0.01-0.05). Significant differences were found between the ratios of protein and blood compared to contrast medium solution (each, p<0.05) and between the ratios of protein and blood in both phantoms with tin filtering (each, p<0.05). Conclusion:DECT allows discrimination between a proxy renal lesion containing contrast agent and lesions containing protein and blood through their different attenuation at 80kV and 140kV. Further discrimination between protein and blood containing proxies is possible when using a tin filter.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dual-energy CT with tin filter technology for the discrimination of renal lesion proxies containing blood, protein, and contrast-agent. An experimental phantom study

et al. 2010

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“…They can be diagnosed by computed tomography (CT) in approximately one-third of patients older than 50 years. 1 However, few require surgical intervention. 2 Pain, infection, abdominal mass effects or obstruction constitute the main indications for surgery.…”

Section: Introductionmentioning

confidence: 99%

Retroperitoneal laparoscopic decortication of simple renal cysts using the bipolar PlasmaKinetic scissors

et al. 2006

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Objectives: To analyse the efficacy, safety and feasibility of retroperitoneal laparoscopic decortication of simple renal cysts using bipolar PlasmaKinetic scissors. Methods: Records of 19 patients who underwent laparoscopic decortication of simple renal cysts, performed with bipolar PlasmaKinetic scissors without additional fulguration of the base or the margin of resection, were retrospectively reviewed. Longterm symptomatic and radiological outcomes were assessed. Results: One single cyst was treated in fourteen (73.7%) cases, two cysts in three (15.8%) cases, three cysts in one (5.2%) case and multiple cysts in one case with autosomal dominant polycystic kidney disease. They were peripherally located in thirteen, peripelvic in three, and parenchymal in two cases. An average of 3.1 trochars were used for each procedure. The mean operating time was 82.5 ± 16.7 min (range, 50-135). Neither open conversion nor blood transfusion was necessary. A total of six minor complications were encountered. Mean hospital stay 2.3 ± 0.9 days (range, 1-4). After a mean follow up of 14.3 ± 5.9 months (range, 3-24), symptomatic success was achieved in 89.5%, and radiological success was accomplished in 88.2%. An asymptomatic cyst recurrence was observed in one (5.9%) case, and one (5.9%) case with residual pain had new cyst formation at another site of the kidney. Conclusions: Retroperitoneal laparoscopic cyst decortication using bipolar PlasmaKinetic scissors is a feasible and efficient method, eliminating further fulguration of the base and the margins of the cysts. Operating times are shorter than previously published series and highly satisfactory long-term success rates are achieved.

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Renal Cell Carcinoma

Mathias

Rini²

2018

The American Cancer Society's Oncology in Practice

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The incidence of simple renal cyst by computed tomography

Cited by 216 publications

References 2 publications

Dual-energy CT with tin filter technology for the discrimination of renal lesion proxies containing blood, protein, and contrast-agent. An experimental phantom study

Dual-energy CT with tin filter technology for the discrimination of renal lesion proxies containing blood, protein, and contrast-agent. An experimental phantom study

Retroperitoneal laparoscopic decortication of simple renal cysts using the bipolar PlasmaKinetic scissors

Renal Cell Carcinoma

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