Bronchogenic cysts and oesophageal duplication cysts are embryological foregut duplication cysts and are also differential diagnoses for a cystic mediastinal mass.
- asymptomatic bronchogenic cyst
- symptomatic oesophageal cyst in the case of peptic ulceration
- bronchogenic cysts appear at a subcarinal location (most commonly)
- oesophageal cysts appear more tubular and in close relation to the oesophagus
- thin-walled bronchogenic cyst
- relatively thick-walled oesophageal cyst (due to the presence of smooth muscle)