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Congenital cystic adenomatoid malformation of the lung (CAM, CCAM)

from Section 3 - Classic and rare scenarios in the neonatal period

Published online by Cambridge University Press:  05 March 2012

Andrea Zimmermann
Affiliation:
Technical University Munich
Georg Hansmann
Affiliation:
Children's Hospital Boston, Harvard Medical School
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Summary

Syndrome

  • Cystic adenomatoid malformation of the lung (CAML)

Definition

CCAM is a pulmonary hamartoma of the lung resulting from excessive growth of the terminal bronchioli leading to alveolar growth arrest. The lesion tends to be unilateral. The hamartoma may contain air or liquid and is connected to the bronchial system. Blood supply comes from the pulmonary circulation. In up to 20% CCAM is associated with malformations such as congenital diaphragmatic hernia (CDH), hydrocephalus, malformation of the bones, kidney, and small intestines.

Epidemiology

  • Incidence approx. 1:30 000 (0.33/1000)

Pathophysiology

  • Compression of surrounding organs, heart failure, hydrops, and lung hypoplasia are possible

  • Possible decrease or increase of mass

  • Poor prognosis in CCAM with fetal hydrops and polyhydramnios

Prenatal diagnosis

  • Ultrasound: macrocystic (diameter >5 mm) and microcystic (diameter <5 mm) forms

Prenatal DDx

  • Sequestrated lung, tumour, CDH (see pp. 404–9), lobar pulmonary emphysema, bronchogenic cyst

! A congenital cystic adenomatoid malformation (CCAM) can be diagnosed prenatally. The expectant mother must be transferred to a tertiary perinatal center prior to delivery.

Prenatal therapy

  • Puncture of a macrocystic malformation may be required

  • In specific cases thoracoamniotic shunting may be considered

  • Prenatal surgical treatment is not yet established

Clinical presentation

  • (Tachy) dyspnea

  • Pallor/cyanosis

  • O2 requirement varies

  • Hydrops fetalis and PPHN are possible

Postnatal DDx

  • Without a prenatal diagnosis: RDS, pneumothorax, aspiration, CDH, pleural effusion

Diagnosis in the delivery room

  • Auscultation: faint breathing sounds on the affected side

  • Blood gas analysis and blood glucose, laboratory work-up, and if necessary blood culture

  • HIV/hepatitis serology, blood type and screen/cross

Type
Chapter
Information
Neonatal Emergencies , pp. 417 - 418
Publisher: Cambridge University Press
Print publication year: 2009

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