Tumor size on computed tomography scans: is one measurement enough?
BACKGROUND
Bidimensional tumor measurements are used routinely as surrogates for tumor volume. The purpose this study was to determine whether there is any added benefit in bidimensional or tridimensional measurements over a unidimensional measurement.


METHODS
Sixty-nine colorectal hepatic metastases on 19 computed tomography scans (1-8 lesions per scan) from 9 patients were analyzed. Five patients contributed 2-4 scans each (mean, 3 scans). The standard volume of these lesions was determined by the "summation of areas" technique. The maximum axial dimension, the product of the greatest axial dimensions, and several volume estimates (based on the volumes of a sphere, an ellipsoid, and a cube) each were correlated with the standard volume.


RESULTS
The maximum axial dimension and the product of the greatest axial dimensions correlated equally with tumor volume (correlation coefficient = 0.93). Surrogate measures based on the equations for a sphere and an ellipsoid underestimated tumor volume, whereas the equation for a cube overestimated volume.


CONCLUSIONS
When reporting tumor size, there is no significant added benefit in reporting bidimensional or tridimensional measurements over the maximum axial dimension.
Dachman
A H
AH
Department of Radiology, Pritzker School of Medicine, The University of Chicago, IL 60637, USA. ahdachma@midway.uchicago.edu
MacEneaney
P M
PM
Adedipe
A
A
Carlin
M
M
Schumm
L P
LP
D003627:Data Interpretation, Statistical; D006801:Humans; D008113:Liver Neoplasms / Q000473:pathology*; D015898:Tomography Scanners, X-Ray Computed