Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is a minimally invasive procedure with a low rate of complications. It is used in the diagnosis of malignant and benign disease such as sarcoidosis. We report a case a 42-year-old man who had undergone EBUS-TBNA for diagnosis of mediastinal and hilar lymph node enlargement. Sarcoidosis was diagnosed on cytologic examination. Three weeks after the procedure, he developed a mediastinal abscess secondary to EBUS-TBNA. Sarcoidosis may be a risk factor for mediastinal infection complication. A local immune defect related to sarcoidosis may explain this risk. Our case underlines the importance of considering and recognizing this complication, and its possibility should be taken into account when undertaking the procedure for benign disease.