Mediastinitis of bronchogenic cyst caused by endobronchial ultrasound-guided transbronchial needle aspiration.

Here, we describe the case of a 56-year-old female patient who was diagnosed with an anterior mediastinal cyst measuring 26 × 16 mm in size. An endobronchial ultrasound-guided transbronchial needle aspiration was performed, and punctures occurred three times. The patient was then prescribed cefditoren pivoxil. Three days after the procedure, the patient developed infective mediastinitis. Panipenem/betamipron, clindamycin, and human immunoglobulin were administered, and her symptoms improved over 2 weeks. Five months after developing mediastinitis, surgical resection of the cyst was performed with inverted L-shaped mini-sternotomy. The cystic lesion strongly adhered to the surrounding tissues. The final pathological diagnosis was a bronchogenic cyst. Endobronchial ultrasound-guided transbronchial needle aspiration is not a completely sterile procedure and can lead to severe infective complications in the mediastinum. Although this procedure may not be contraindication for use with mediastinal cystic lesions, physicians must take into account the risk of severe infective complications.