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Large Coalescent Parenchymal Nodules in Pulmonary Sarcoidosis: "Sarcoid Galaxy" Sign

¹ Department of Radiology and Nuclear Medicine, Kyoto University Hospital, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.
² Present address: Department of Radiology, University of Pennsylvania Medical Center, 3400 Spruce St., Philadelphia, PA 19104.
³ Chest Disease Research Institute, Kyoto University Hospital, Sakyo-ku, Kyoto 606-8507, Japan.
⁴ Department of Radiology, Fukui Medical University, 23 Shimoaizuki, Matsuoka-cho, Yoshida-gun, Fukui 910-1193, Japan.

OBJECTIVE. The purpose of this study was to evaluate the large parenchymal nodules in pulmonary sarcoidosis and to describe a new CT sign termed the "sarcoid galaxy."

CONCLUSION. The CT appearance of pulmonary sarcoidosis suggests that the large nodules arise from a coalescence of small nodules. The large nodules are surrounded by many tiny satellite nodules. These findings were considered to simulate the appearance of a galaxy. This observation was supported by radiologic—pathologic correlation. The sarcoid galaxy sign may be a useful adjunct in the diagnosis of pulmonary sarcoidosis.

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