Bronchogenic cyst is a benign congenital developmental abnormality. It is most commonly located in middle mediastinum. Its association with pleural effusion is rare. Sometimes it may present with a fixed compression over trachea or oesophagus. We report the rare occurrence of bronchogenic cyst in antero-superior mediastinum mimicking a mass lesion with right-sided pleural effusion and tracheal compression only during expiration in a 39-year-old male.
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