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"BRONCHOGENIC CYST"

“ This is the most common foregut malformation in the thorax . It constitutes up to 20% of mediastinal masses. It is an abnormality of the v...

This is the most common foregut malformation in the thorax. It constitutes up to 20% of mediastinal masses. It is an abnormality of the ventral diverticulum of the primitive foregut and is associated with other congenital anomalies, spina bifida, extra-lobar sequestration and congenital lobar emphysema.
PLAIN FILM
•  Posterior or middle mediastinal mass, typically subcarinal and more common on the right
•  Can be intrapulmonary—most commonly located in the medial lower lobes
CT
•  Well-circumscribed spherical mass, usually with an internal density of 0-25 HU (may be higher)
•  May contain an air-fluid level if communicating with an airway
•  Rim-enhancement may be seen, calcification is not typical