We report a rare case of bronchogenic cyst associated with congenital complete absence of the pericardium. A 17-year-old male was admitted to the hospital for surgical resection of a growing cystic lesion located in the middle mediastinum. The patient was asymptomatic and no significant findings were found on physical examination. Resection of the mediastinal cyst was performed by video-assisted thoracoscopic surgery. The complete absence of the pericardium was immediately observed along with a cystic tumor arising from the mediastinum. After the resection of the cyst, no additional procedure to reconstruct the absence of the left pericardium was performed. Pathological diagnosis was a bronchogenic cyst. Congenital absence of the pericardium may be associated with the bronchogenic cyst and complete absence of the pericardium requires no additional surgical reconstruction, if remaining space in the pleural cavity is small enough to avoid cardiac disposition after surgical resection of the cyst.
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