<prompt> All regarding bronchial cyst are true ExceptSeen in mediastinum50-70 of lungAre commonly affectedMultilocular  <response>: Bronchigenic cyst Bronchogenic cysts originate as sequestrations from the ventral foregut, the antecedent of the tracheobronchial tree Cyst wall is composed pathognomic inner layer of ciliated respiratory epithelium MC location : Middle mediastinum 65-90 Bronchogenic cyst Mediastinal - Sub-carinal, right paratracheal and hilar locations are most common. Does not communicate with the tracheobronchial tree Parenchymalintrapulmonary - Typically perihilar with predilection for lower loves. Communicate with the tracheobronchial tree Clinical features Two - thirds are asymptomatic May produce symptoms that depend on their anatomic location Paratracheal region : Airway compression and respiratory distress Lung parenchyma : Become infected, present with fever and cough Ref: Bailey and love 27th edition Pgno :938 