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Fetal Lung Masses (CPAM and BPS)

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What are Fetal Lung Masses?

In rare circumstances, fetuses can develop an abnormal growth (called a mass) in a lung. Two of the most common of these rare conditions are congenital pulmonary airway malformation (CPAM) and bronchopulmonary sequestration (BPS).

What Is the Difference between CPAM and BPS?

Congenital pulmonary airway malformation (CPAM) is an abnormal growth of fetal lung tissue that forms during pregnancy. The mass pushes on the remaining lung tissue and heart. This condition was also previously known as congenital cystic adenomatoid malformation (CCAM). CPAM is extremely rare, affecting only one in 25,000 pregnancies.

Bronchopulmonary sequestration (BPS) is a mass of fetal lung tissue that receives its blood supply from the aorta. BPS is even rarer than CPAM.

Neither CPAM nor BPS is considered a genetic or hereditary condition, and both are unlikely to happen again in another pregnancy.

By the Numbers


Babies with CPAM/BPS Evaluated in the Last 5 Years by Maternal-Fetal Care


Operative Procedures Performed Annually by Pediatric Surgery

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UR Medicine's Treatments for Fetal Lung Masses (CPAM and BPS)

How are fetal lung masses diagnosed?

If you are referred for a suspected CPAM/BPS, our team will perform a detailed, high-resolution Level II ultrasound. Based on the findings of the ultrasound, we can help determine the follow-up needed and the likelihood of complications after birth.

Our Pediatric Cardiology team will also perform a fetal echocardiogram to evaluate the cardiac health of the fetus.

How are fetal lung masses treated?

Most fetuses will require close monitoring but will not develop complications, and most masses begin to decrease in size by 26 to 28 weeks.

Treatment will be needed if the mass compresses the lungs or the heart, as there is then a risk of developing underdeveloped lungs, high blood pressure, or fluid build-up in the fetus (a condition known as hydrops). In these cases, the mass will need to be evaluated and removed. If necessary, emergency care and breathing assistance will be provided.

What Sets Us Apart?

At UR Medicine, we understand that facing a pregnancy with a complex condition can be overwhelming. Our team of fetal and maternal care coordinators will be here to help navigate your visits, questions, and challenges.

Golisano Children's Hospital's Pediatric Surgery team has decades of experience operating on infants and children and performs approximately 2,000 operative procedures a year. Our maternal and fetal care experts offer a complete range of diagnostic and treatment options to care for babies with this condition.

UR Medicine has AIUM Accreditation in:

  • Obstetrical ultrasound
  • Detailed fetal anatomic examination (Level II ultrasound)
  • GYN ultrasound
  • Fetal echocardiography

Maternal-Fetal Medicine Granted AIUM Accreditation 2021-2024


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We serve you in the Rochester metropolitan area and surrounding region.

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6 locations

Reproductive Genetics - Rochester

Lattimore Medical Center
125 Lattimore Road, West Entrance, Suite 150
Rochester, NY 14620

Maternal-Fetal Medicine - Henrietta

500 Red Creek Drive, Suite 210
Rochester, NY 14623

Maternal-Fetal Medicine - Rochester

Lattimore Medical Center
125 Lattimore Road, West Entrance, Suite 150
Rochester, NY 14620

Maternal-Fetal Medicine - Rochester

Highland Perinatal Center
990 South Avenue, Suite 103
Rochester, NY 14620

Maternal-Fetal Medicine - Rochester

Highland Perinatal Center
909 Culver Road
Rochester, NY 14609

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