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Differential diagnosis of complex renal cysts based on lesion size along with the Bosniak renal cyst classification

 Hyun Ho Han  ;  Kyung Hwa Choi  ;  Young Taik Oh  ;  Seung Choul Yang  ;  Woong Kyu Han 
 Yonsei Medical Journal, Vol.53(4) : 729-733, 2012 
Journal Title
 Yonsei Medical Journal 
Issue Date
PURPOSE: To identify size criteria for complex cystic renal masses that can distinguish renal cell carcinoma from benign cysts supplementing the Bosniak classification. MATERIALS AND METHODS: We reviewed the records of 97 patients who underwent surgery for complex cystic renal masses from January 2001 to April 2010. The pathological results were compared with the lesion sizes measured by preoperative computed tomography and other radiological features (contrast enhancement, irregularities of cyst walls and septa, and calcification) were also obtained for categorization according to the Bosniak renal cyst classification. RESULTS: Malignancy was significantly associated with cyst size (>2 cm), male gender, and younger patient age (<50 years). According to the Bosniak classification, there was no category I cyst, and all 8 category II cysts were benign. However, 3 of 18 (17%) category IIF cysts, 21 of 39 (54%) category III cysts, and 29 of 32 (90%) category IV cysts were malignant. All category IIF cysts were benign in patients older than 50 years of age. CONCLUSION: Many complex cystic renal masses smaller than 2 cm were benign. We suggest that lesion size should be taken into account when formulating treatment plans for complex cystic renal masses.
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1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Urology (비뇨의학교실)
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실)
Yonsei Authors
양승철(Yang, Seung Choul)
오영택(Oh, Young Taik) ORCID logo https://orcid.org/0000-0002-4438-8890
최경화(Choi, Kyung Hwa)
한웅규(Han, Woong Kyu)
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