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©2013 UpToDate ® Print Email Prenatal ultrasound of a congenital pulmonary airway malformation (CPAM)* After measuring the longest dimension of the lesion (L), the probe is turned 90 degrees and the "width" (W) and "height" (H) of the lesion are measured. The L x W x H x 0.52 = volume of CPAM. The CPAM volume ratio (CVR) is then calculated by dividing the CPAM volume by the head circumference. *CPAM was previously known as congenital cystic adenomatoid malformation (CCAM) Courtesy of Courtney Stephenson, MD and Andrew P Schuller, RDMS.