I am 20 weeks pregnant and at my routine ultrasound they detected a 2cm mass in the baby's left lung. The radiologist gave a primary diagnosis of congenital cystic adenomatoid malformation (CCAM) Our OB has never seen this so she referred us to a genenticist for follow up. My questions are: What is the likelyhood that this mass actually exists. (I am basing this question on numerous conversations with people who were told their baby had a major defect, when in fact he/she was fine) Also,any thoughts on why they would send us to a geneticist? I am 31 years old, have 1 healthy 2 year old daughter, and have no genetic hisory to speak of. Neither does my husband. I'm wondering if they got us all worried about something that may in fact end up to be nothing. Any feedback you could provide would be greatly appreciated.