Congenital
Bronchial
Cysts
Congenital
Bronchial
Cysts
Congenital Bronchial Cysts
General
Form in first trimester of pregnancy
Most common type of mediastinal cyst in
infant
Do not communicate with tracheobronchial
tree unless infected
More common in males and Yemenite Jews
Congenital Bronchial Cysts
Embryology
Primitive foregut gives rise to esophagus
(dorsal segment) and tracheobronchial
tree (ventral segment)
Congenital Bronchial Cysts
Embryology
Abnormal budding of ventral segment
of foregut gives rise to bronchial cysts
Congenital Bronchial Cysts
Embryology
Failure of solid core of esophagus to
cannulate leads to esophageal
duplications and abnormalities of
dorsal segment leading to neurenteric
cysts
Congenital Bronchial Cysts
Types
Mediastinal
Parenchymal
Congenital Bronchial Cysts
Mediastinal
More common
Occur around carina
Associated with spinal abnormalities
Usually asymptomatic
Congenital Bronchial Cysts
Parenchymal
Much less common
Usually occur in lower lobes
Become infected and thus contain air
May present with hemoptysis
Congenital Bronchial Cysts
X-Ray Findings
Most are middle mediastinal
Occur around carina, upper trachea or
along bronchi
Almost all are fluid-filled
Appear as solid, well-defined, sharply
marginated mass
Rarely may contain milk of calcium