Table 3:

Proposed Modifications to the Definitions of Terms Used in the Bosniak Classification of Cystic Renal Masses, Version 2019

Note.—Unless otherwise specified, features may be assessed at CT or MRI.

*Convex protrusions arising from a wall or septa are either nodules (any size if acute margins with walls or septa, or ≥ 4 mm if obtuse margins with wall or septa) or irregular thickening (≤ 3 mm if obtuse margins with wall or septa). Size measurements are obtained perpendicular to the wall or septa of origin. If convex protrusion(s) are on both sides of a wall or septum, the cumulative perpendicular distance is used and excludes the thickness of the underlying wall or septum.