1. Um SJ, Park BH, Son C. An aortoesophageal fistula in patient with lung cancer after chemo-irradiation and subsequent ssophageal stent implantation J Thorac Oncol 2009;4:263-265.

2. Um SJ, Yang DK, Lee, Son CH, Roh MS, Kim KN, Lee KN, Choi PJ, Bang JH. Acase of mediastinal teratoma associated with elevated tumor marker in chonic empyema. Tuberc Respir Dis 2009;66:127-131.

3. Um SJ, Lee SK, Yang DK, Son C, Kim KN, Lee KN, Kim YS. Four cases of a cerebral air embolism complicating a percutaneous transthoracic needle biopsy. Korean J Radiol 2009;10:81-84.

4. Um SJ, Yang DK, Lee SK. Hypersensitivity pneumonitis following intravesical bacille calmette-gu in immunotherapy for superficial bladder cancer. J Investig Allergol Clin Immunol 2009;19:230-23.

5. Um SJ, Lee SK, Yang DK, Son C, Rho MS, Kim KN, Lee KN, Choi PJ. Fatal interstitial lung disease after erlotinib administration in a patient with radiation fibrosis. Clin Respir J. 2009;3:181-4.