How is the CPAM Volume Ratio (CVR) calculated?

The CPAM Volume Ratio (CVR) is a valuable metric used in the assessment of Congenital Pulmonary Airway Malformation (CPAM), particularly to evaluate how the size of the lesion compares to the size of the fetus. The calculation of CVR specifically involves measuring the lesion's volume using a three-dimensional approach.

To obtain the volume of the lesion, it is typically calculated using the formula for the volume of an ellipsoid, which approximates the dimensions of the CPAM. This formula is often represented as (Length * Width * Height) multiplied by a specific coefficient, which in this case is 0.52. The coefficient adjusts for the shape of the lesion to provide a more accurate representation of its volume.

Thus, the correct method for calculating the CPAM Volume Ratio involves using the dimensions of the lesion in the context of this ellipsoid volume approximation, highlighting why the understanding of three-dimensional measurements is crucial in maternal-fetal medicine assessments.