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A CCAM is caused by overgrowth of abnormal lung tissue that may form fluid-filled cysts. The cysts prevent the tissue from functioning as normal lung tissue.
Can a CCAM be diagnosed before birth?
Yes, a CCAM can often be detected during a routine prenatal ultrasound, when doctors can see the location and size of the growth, which appears as a bright mass. The fetus’ heart may be shifted to the opposite side of her chest, and her normal lung tissue may be difficult to see on the side where the mass is located. Magnetic Resonance Imaging (MRI) may also be used to see the mass.
What happens during pregnancy?
In most cases, the fetus will do well and the mother will carry the baby to term without a problem. If your doctor suspects a CCAM, you will undergo a series of ultrasounds between your 20th to 30th week of pregnancy to see if it continues to grow. During that time, the fetus will grow rapidly, and the mass may appear smaller or unchanged. The CCAM may also shrink and even disappear during the third trimester of pregnancy.
However, in a small number of cases, the mass may grow to be life-threatening to the fetus. As it grows, there is the chance that it might compress blood vessels, making the heart have to pump harder to circulate blood, and possibly leading to heart failure (hydrops).
Can CCAM be treated prior to birth?
CCAM is often treated when the fetus develops hydrops or impending hydrops. Your doctor can monitor this closely by ultrasound. Signs of hydrops may include the following symptoms in the fetus:
Our doctors will also be paying close attention to the mother's health. As the fetus develops hydrops, the mother may show symptoms of preeclampsia (a condition marked by high blood pressure and protein in the urine). If the mother is ill and the hydrops gets too severe, doctors may not be able to perform surgery.
If the fetus develops hydrops that isn’t too severe (or hydrops development seems imminent) and the mother’s health allows, prenatal intervention will be offered sometime prior to 28 weeks gestation. The procedure involved depends on the type of CCAM.
Sometimes when the mass is solid--and even sometimes when it is cystic--it will need to be removed during open fetal surgery. This procedure usually occurs prior to 28 weeks of pregnancy. During the procedure:
There is a risk for preterm labor when an incision is made in the uterus, but medications are available to help control the contractions. For more information, please see Fetal Surgery.
What happens after the baby is born?
We recommend that all babies with a CCAM, even those who underwent prenatal surgery, be delivered at a hospital with a Neonatal Intensive Care Unit (NICU). Often babies will have no symptoms after birth. When this happens, an x-ray will be performed and the baby will go home with mother.
When the baby is around 3 months old, she will have a special x-ray called a CT scan, which produces a 3-dimensional image of her lung and the growth.
Sometimes, babies have difficulties breathing after birth and require oxygen and assistance with breathing. Doctors may place a breathing tube and the baby will undergo an operation to remove the mass. After surgery, the baby will stay in the hospital for about a week.
We will schedule surgery to remove the CCAM during the baby's is 3 to 6 months old. The hospital stay is usually about three to five days, and your pediatric surgeon will continue to see the baby after she is discharged from the hospital.
What is the long-term outlook for babies with a CCAM?
Babies who have the CCAM removed either before or after birth usually do well afterwards. Babies’ lungs continue to grow until the child is 9 years old, leaving plenty of time for the development of normal healthy lungs.
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