Centrality Index (C Index) for a Renal Tumor

Patient selection: renal tumor

Parameters:

(1) central distance in cm (distance between the central point of the kidney and the center of the tumor)

(2) tumor radius in cm

centrality index =

= (central distance) / (radius of the tumor)

Interpretation:

• minimum score: 0

• maximum score: depends on the location and the size of tumor

• A C index of 0 indicates that the center of the tumor is at the center of the kidney.

• The lower the index the greater the operative complexity for partial nephrectomy.