Malignancy rates of Bosniak types for renal cystic lesions

Abstract

Objective:  The aim of this study was to determine the malignancy rates in different Bosniak types of renal cystic lesions.  

Material and Methods: This was retrospective cross–sectional study conducted in Radiology department, Hayatabad Medical Complex Peshawar from June 2019 to December 2019. Record of 142 patients who were operated for renal cystic lesions in Institute of Kidney Diseases Peshawar were evaluated retrospectively. Bosniak type of cyst for each patient was determined by retrieving and reviewing CT urograms. Histopathological diagnosis (benign or malignant) of each cystic lesion was determined from patients’ records. The data was entered and analyzed in SPSS version 20. 

Results: A total of 142 patients operated for renal cystic lesions were included in the study. There were 76 (53.5%) males and 66 (46.5%) females. Out of 142, 45(31.69%) patients had type I cysts, 30(21.13%)  type II cysts, 15 (10.56%) type IIF cysts, 29(20.42%) type III cysts and 23(16.20%) patients had type IV cysts. In this study, all type I cysts were benign. The malignancy rates of Type II, type IIF, type III and type IV cysts were 3.3%, 13.3%, 58.6% and 87.0 %, respectively. The difference in malignancy rates among different types of renal cystic lesions was statistically significant (p<0.001).

Conclusion: Though the malignancy rate of renal cystic lesions increases as their bosniak type increases, a conservative approach rather than surgery may be justified in patients with lower bosniak types.