RESUMEN
Recently, the proportion of extrapulmonary tuberculosis in patients has increased in Korea. Though intestinal tuberculosis in not infrequent, a duodenal fistula caused by tuberculosis is a rare condition. A 29-year-old man was admitted to the Department of Internal Medicine because of fever and weight loss. The patient was a doctor participating in a resident fellowship. The patient was diagnosed with intra-abdominal tuberculous lymphadenopathy and was given anti-tuberculous medication. One month after the administration of medication, the patient showed symptoms and signs of duodenal obstruction because of marked duodenal wall edema and a deep ulcer on the second portion of the duodenum. A computerized tomogram and duodenography revealed the formation of a fistula at the second portion of the duodenum and the presence of abscess-forming tuberculous lymphadenopathy. The use of continuous anti- tuberculous medication resulted in the improvement of the clinical symptoms, with complete healing of the duodenal fistula and tuberculous lymphadenitis. This case suggests that transient clinical worsening in intra-abdominal tuberculous lymphadenitis may occur during an early period of anti- tuberculous medication.