AJR 2005; 184:639-642
© American Roentgen Ray Society
Pulmonary Tuberculosis: Another Disease Showing Clusters of Small Nodules
Jeong-Nam Heo1,
Yo Won Choi,
Seok Chol Jeon and
Choong Ki Park
1 All authors: Department of Diagnostic Radiology, Hanyang University Hospital,
17 Haengdang-Dong, Sungdong-Gu, Seoul 133792, South Korea.
OBJECTIVE. Pulmonary sarcoidosis was recently reported to show the
"sarcoid galaxy" sign, indicating large pulmonary nodules composed
of coalescent small nodules. The purpose of this study was to review cases of
pulmonary tuberculosis showing CT features indistinguishable from the sarcoid
galaxy sign.
CONCLUSION. Large nodules arising from the coalescence of small
nodules may be seen in active tuberculosis and in sarcoidosis. The CT finding
was termed "clusters of small nodules" instead of the
"sarcoid galaxy sign" in this article. A single cluster of small
nodules, clusters of small nodules in the superior segment of the lower lobe,
or clusters of small nodules not associated with lymphadenopathy or associated
with tree-in-bud lesions would favor the diagnosis of active pulmonary
tuberculosis rather than pulmonary sarcoidosis.

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Copyright © 2005 by the American Roentgen Ray Society.