Objective To evaluate the features of fetal mediastinal type bronchogenic cyst on prenatal MRI. Method The prenatal MR images and postnatal CT images of 3 cases with mediastinal type bronchogenic cyst confirmed by pathology were analyzed retrospectively. The characteristics of MRI diagnosis and differentiation diagnosis were summarized through literature review. Results The fetal mediastinal type bronchogenic cyst on MRI was usually shown as a single, round-like, well-defined cystic mass, some had the lobulated or irregular shape. Most of them closely attached to trachea and bronchus. The differentiation diagnosis included esophageal cyst, lymphangioma, enterogenous cyst, etc. Conclusions Fetal mediastinal type bronchogenic cysts have characteristic MRI features, which favor their prenatal diagnosis.
