Table 6.

Summary of Bosniak classification describing the type of cysts, the associated risk of malignancy, and its management

Bosniak class	Type of lesion	Risk of malignancy	Management
I	Benign simple cyst	0%	No follow-up
II	Benign minimally complex cyst	0%	No follow-up
IIF	Likely benign cystic mass	5–10%	Follow-up for 5 years: ▪ Every 6 months for 2 years ▪ Once a year for 3 years
III	Uncertain nature	50%	Urology consult
IV	Malignant cystic nature	90%	Urology consult