Cystic lung lesions, such as congenital cystic adenomatoid m…

Cystic lung lesions, such as congenital cystic adenomatoid malformations (CCAM) and pulmonary sequestrations, can present with varying clinical manifestations in neonates. Prognosis is highly variable between severity of lesion, organ involvement, and surgical/clinical course.  Which of the following is the biggest indicator of a good prognosis?