Internal Medicine
Online ISSN : 1349-7235
Print ISSN : 0918-2918
ISSN-L : 0918-2918
CASE REPORTS
Solitary Pulmonary Nodule Due to Mycobacterium kansasii
Masaaki AbeYoshihiro KobashiKeiji MouriYasushi ObaseNaoyuki MiyashitaMasao NakataMikio Oka
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JOURNAL OPEN ACCESS

2011 Volume 50 Issue 7 Pages 775-778

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Abstract

A 46-year-old man with no past history of underlying disease was admitted to our hospital for examination of abnormal chest shadow on chest radiograph. He had no respiratory symptoms on admission. Chest radiograph showed a solitary nodule (35×20 mm) in the left upper lung field. On chest CT, this nodule in the left upper lobe (S1+2) did not demonstrate calcification, the margin was clear but irregular, and there was pleural indentation. The solitary nodule was strongly positive on PET/CT. Therefore, we suspected primary lung cancer. Because we could not establish the diagnosis by bronchoscopic examination, video-assisted thoracoscopic surgery (VATS) was performed. Histological diagnosis of the solitary nodule demonstrated epitheloid granuloma with caseous necrosis. Smear test of the resected tissue was positive for acid-fast bacilli and culture was positive for mycobacteria, which was identified as Mycobacterium kansasii. There are a few case reports of solitary nodule due to M. kansasii.

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© 2011 by The Japanese Society of Internal Medicine
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