The topic of renal cystic lesions is described in the article. The localization and structure of solitary, parapelvic and multiple sinus cysts are discussed. The Bosniak classification (1986) is presented, as well as the updated Bosniak classification, in which a number of modifications in 2019 were made. The contemporary diagnostic methods are mentioned, as well as factors that allow to select patient for active surveillance. Current surgical procedures are presented.