Yonsei Med J.  2010 Jul;51(4):552-556. 10.3349/ymj.2010.51.4.552.

Clinical Characteristics and Treatment Outcomes of Mycobacterium kansasii Lung Disease in Korea

• Park HK
• Koh WJ
• Shim TS
• Kwon OJ

• KMID: 1805193
• DOI: http://doi.org/10.3349/ymj.2010.51.4.552

Abstract

PURPOSE
While Mycobacterium kansasii is a common cause of nontuberculous mycobacterial (NTM) lung disease in many developed countries, M. kansasii is infrequently isolated in Korea. We investigated the clinical and radiological features and treatment outcomes of M. kansasii lung disease in Korea retrospectively.
MATERIALS AND METHODS
We identified 41 patients with M. kansasii lung disease who met the diagnostic criteria for NTM lung disease in two tertiary referral hospitals in Seoul, Korea, between January 1998 and December 2007.
RESULTS
Their median age was 63 years [interquartile range (IQR) 51-75 years] and 33 (81%) were men. Twenty-three patients (56%) were smokers and 13 patients (32%) had previous pulmonary tuberculosis. The most common radiographic findings were nodules (n = 22, 54%) and consolidation (n = 22, 54%). Cavitation was present in 13 patients (32%). Thirty-one patients (76%) were treated with isoniazid, rifampin, and ethambutol. The median treatment duration was 16 months (IQR 9-18 months). The negative conversion rate after 12 months of treatment was 95%.
CONCLUSION
Clinicians should be aware of the various radiographic manifestations of M. kansasii lung disease. With appropriate treatment, these patients have a good prognosis.

Keyword

Nontuberculous mycobacteria; Mycobacterium kansasii; treatment outcome

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